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{{DISPLAYTITLE:G<sub>δ</sub> set}}
In [[theoretical physics]], '''negative mass''' is a hypothetical concept of matter whose [[mass]] is of opposite sign to the mass of normal matter, e.g. −2&nbsp;kg. Such matter would violate one or more [[energy condition]]s and show some strange properties, stemming from the ambiguity as to whether attraction should refer to force or the oppositely oriented acceleration for negative mass. It is used in certain speculative theories, such as on the construction of [[wormhole]]s. The closest known real representative of such exotic matter is a region of pseudo-[[Pressure#Negative pressures|negative pressure]] density produced by the [[Casimir effect]]. Although [[general relativity]] well describes the [[Newton's laws of motion|laws of motion]] for both positive and [[negative energy]] particles, hence negative mass, it does not include the [[Fundamental interaction|fundamental forces]] other than [[gravitation]]. Whereas the [[Standard Model]] which describes [[elementary particle]]s does not encompass gravitation, which is yet intimately involved in the origin of mass and [[inertia]]. Thus a correct particle model should explicitly include gravity.
In the mathematical field of [[topology]], a '''G<sub>δ</sub> set''' is a [[subset]] of a [[topological space]] that is a countable intersection of open sets. The notation originated in [[Germany]] with ''G'' for ''[[wikt:Gebiet#German|Gebiet]]'' (''[[German language|German]]'': area, or neighborhood) meaning [[open set]] in this case and δ for ''[[wikt:Durchschnitt#German|Durchschnitt]]'' (''German'': [[intersection (set theory)|intersection]]).  
The term '''inner limiting set''' is also used.  G<sub>δ</sub> sets, and their dual [[F-sigma set|F<sub>&sigma;</sub> sets]], are the second level of the [[Borel hierarchy]].


==Definition==
==In general relativity==
In a topological space a '''G<sub>δ</sub> set''' is a [[countable]] [[intersection (set theory)|intersection]] of [[open set]]s. The G<sub>δ</sub> sets are exactly the level <math>\mathbf{\Pi}^0_2</math> sets of the [[Borel hierarchy]].


==Examples==
Negative mass is generalized to refer to any region of space in which for some observers the mass density is measured to be negative. This could occur due a region of space in which the stress component of the Einstein [[stress–energy tensor]] is larger in magnitude than the mass density. All of these are violations of one or another variant of the positive [[energy condition]] of Einstein's general theory of relativity; however, the positive energy condition is not a required condition for the mathematical consistency of the theory. Various versions of the positive energy condition, weak energy condition, dominant energy condition, ''etc.'', are discussed in mathematical detail by [[Matt Visser]].<ref>{{Cite book|first=M.|last= Visser |year=1995|title=Lorentzian Wormholes: from Einstein to Hawking|publisher= AIP Press|location= Woodbury NY|isbn= 1-56396-394-9}}</ref>
* Any open set is trivially a G<sub>δ</sub> set


* The [[irrational numbers]] are a G<sub>δ</sub> set in '''R''', the real numbers, as they can be written as the intersection over all [[rational number|rational]] numbers  ''q'' of the [[complement (set theory)|complement]] of {''q''} in '''R'''. Note that the set of [[Rational number|rational]] numbers is not a G<sub>δ</sub> set in '''R'''.
===Inertial versus gravitational===


* The rational numbers '''Q''' are '''not''' a G<sub>δ</sub> set.  If we were able to write '''Q''' as the intersection of open sets ''A<sub>n</sub>'', each ''A<sub>n</sub>'' would have to be  [[dense set|dense]] in '''R''' since '''Q''' is dense in '''R'''.  However, the construction above gave the irrational numbers as a countable intersection of open dense subsets.  Taking the intersection of both of these sets gives the [[empty set]] as a countable intersection of open dense sets in '''R''', a violation of the [[Baire category theorem]].
The earliest references to negative weight are due to the observation that metals gain weight when oxidizing in the study of [[phlogiston theory]] in the early 1700s.


* The zero-set of a derivative of an everywhere differentiable real-valued function on '''R''' is a G<sub>δ</sub> set; it can be a dense set with empty interior, as shown by  [[Pompeiu derivative#Pompeiu's construction|Pompeiu's construction]].
Ever since [[Isaac Newton|Newton]] first formulated his theory of [[gravity]], there have been at least three conceptually distinct quantities called [[mass]]: [[inertial mass]], "active" [[gravitational mass]] (that is, the source of the gravitational field), and "passive" gravitational mass (that is, the mass that is evident from the force produced in a gravitational field). The Einstein [[equivalence principle]] postulates that inertial mass must equal passive gravitational mass. The law of [[Momentum|conservation of momentum]] requires that active and passive gravitational mass be identical. All experimental evidence to date has found these are, indeed, always the same. In considering negative mass, it is important to consider which of these concepts of mass are negative. In most analyses of negative mass, it is assumed that the equivalence principle and conservation of momentum continue to apply, and therefore all three forms of mass are still the same.


A more elaborate example of a G<sub>δ</sub> set is given by the following theorem:
In his first prize essay for the 1951 [[Gravity Research Foundation]] competition, [[Joaquin Mazdak Luttinger]] considered the possibility of negative mass and how it would behave under gravitational and other forces.<ref name="Luttinger 1951">{{cite journal |last=Luttinger |first=J. M. |year=1951 |title=On "Negative" mass in the theory of gravitation |url=http://www.gravityresearchfoundation.org/pdf/awarded/1951/luttinger.pdf |journal=Awards for Essays on Gravitation |publisher=Gravity Research Foundation}}</ref>


'''Theorem:''' The set <math>D=\left\{f \in C([0,1]) : f \text{ is not differentiable at any point of } [0,1] \right\}</math> is dense in <math>C([0,1])</math> and contains a G<sub>δ</sub> subset of the metric space <math>C([0,1])</math><ref name="Negrepontis 1997">{{cite book|last1=Νεγρεπόντης|first1=Σ.|last2=Ζαχαριάδης|first2=Θ.|last3=Καλαμίδας|first3=Ν.|last4=Φαρμάκη|first4=Β.|title=Γενική Τοπολογία και Συναρτησιακη Ανάλυσγη|year=1997|publisher=Εκδόσεις Συμμετρία|location=Αθήνα, Ελλάδα|isbn=960-266-178-Χ|pages=55–64|url=http://www.simmetria.gr/eshop/?149,%CD%C5%C3%D1%C5%D0%CF%CD%D4%C7%D3-%D3.-%C6%C1%D7%C1%D1%C9%C1%C4%C7%D3-%C8.-%CA%C1%CB%C1%CC%C9%C4%C1%D3-%CD.-%D6%C1%D1%CC%C1%CA%C7-%C2.-%C3%E5%ED%E9%EA%DE-%D4%EF%F0%EF%EB%EF%E3%DF%E1-%EA%E1%E9-%D3%F5%ED%E1%F1%F4%E7%F3%E9%E1%EA%DE-%C1%ED%DC%EB%F5%F3%E7|accessdate=3 April 2011|language=Greek|chapter=2, Πλήρεις Μετρικοί Χώροι}}</ref>
In 1957, following Luttinger's idea, [[Hermann Bondi]] suggested in a paper in ''[[Reviews of Modern Physics]]'' that mass might be negative as well as positive.<ref name="Bondi 1957">{{Cite journal|first=H. |last=Bondi |date=July 1957|url=http://prola.aps.org/abstract/RMP/v29/i3/p423_1 |title=Negative Mass in General Relativity|journal=Rev. Mod. Phys.|volume= 29|issue= 3 |pages= 423|doi=10.1103/RevModPhys.29.423 |bibcode=1957RvMP...29..423B}}</ref> He pointed out that this does not entail a logical contradiction, as long as all three forms of mass are negative, but that the assumption of negative mass involves some counter-intuitive form of motion.  For example,  an object with negative inertial mass would be expected to accelerate in the opposite direction to that in which it was pushed.


==Properties==
There have been several other analyses of negative mass, for example R.H. Price,<ref>{{cite journal|last1=Price|first1=R. M.|title=Negative mass can be positively amusing|journal=Am. J. Phys.|date=1993|volume=61|page=216|doi=10.1119/1.17293 |url=http://people.westminstercollege.edu/faculty/ccline/courses/resources/wp/pdf/AJP000216.pdf}}</ref> however none addressed the question of what kind of energy and momentum would be necessary to describe non-singular negative mass.  Indeed, the Schwarzschild solution for negative mass parameter has a naked singularity at a fixed spatial position.  The question that immediately comes up is, would it not be possible to smooth out the singularity with some kind of negative mass density.  The answer is yes, but not with energy and momentum that satisfies the [[Energy condition#Dominant energy condition|dominant energy condition]].  This is because if the energy and momentum satisfies the dominant energy condition within a spacetime that is asymptotically flat, which would be the case of smoothing out the singular negative mass Schwarzschild solution, then it must satisfy the positive energy theorem, i.e. its [[ADM formalism|ADM mass]] must be positive, which is of course not the case.<ref>{{cite journal|last1=Shoen|first1=R.|last2=Yao|first2=S.-T.|title=On the proof of the positive mass conjecture in general relativity|journal=Commun. Math. Phys.|date=1979|volume=65|page=45 |url=http://www.doctoryau.com/papers/PositiveMassConjecture.pdf}}</ref><ref>{{cite journal|last1=Witten|first1=Edward|title=A new proof of the positive energy theorem|journal=Comm. Math. Phys.|date=1981|volume=80|page=381 |url=http://projecteuclid.org/euclid.cmp/1103919981}}</ref> However, it was noticed by Belletête and Paranjape that since the positive energy theorem does not apply to asymptotic de Sitter spacetime, it would actually be possible to smooth out, with energy-momentum that does satisfy the dominant energy condition, the singularity of the corresponding exact solution of negative mass Schwarzschild-de Sitter, which is the singular, exact solution of Einstein's equations with cosmological constant.<ref>{{cite journal|last1=Belletête|first1=Jonathan|last2=Paranjape|first2=Manu|title=On Negative Mass|journal=Int.J.Mod.Phys.|date=2013|volume=D22|page=1341017|doi=10.1142/S0218271813410174 |arxiv=1304.1566}}</ref> In a subsequent article, Mbarek and Paranjape showed that it is in fact possible to obtain the required deformation through the introduction of the energy-momentum of a perfect fluid.<ref>{{cite journal|last1=Mbarek|first1=Saoussen|last2=Paranjape|first2=Manu|title=Negative Mass Bubbles in De Sitter Spacetime|journal=Phys. Rev. D (R)|date=2014|volume=D90|page=101502|doi=10.1103/PhysRevD.90.101502 |arxiv=1407.1457}}</ref>


The notion of G<sub>δ</sub> sets in [[Metric space|metric]] (and [[Topological space|topological]]) spaces is strongly related to the notion of [[Complete metric space|completeness]] of the metric space as well as to the [[Baire category theorem]]. This is described by the [[Mazurkiewicz]] theorem:
===Runaway motion===
Although no particles are known to have negative mass, physicists (primarily [[Hermann Bondi]] in 1957,<ref name="Bondi 1957" /> [[William B. Bonnor]] in 1989,<ref name="Bonnor 1989">{{Cite doi|10.1007/BF00763458}}</ref> then [[Robert L. Forward]]<ref name="Forward 1990">{{Cite doi|10.2514/3.23219}}</ref>) have been able to describe some of the anticipated properties such particles may have. Assuming that all three concepts of mass are equivalent the gravitational interactions between masses of arbitrary sign can be explored, based on the [[Einstein field equations]]:


'''Theorem''' ([[Mazurkiewicz]]): Let <math>(\mathcal{X},\rho)</math> be a complete metric space and <math>A\subset\mathcal{X}</math>. Then the following are equivalent:
* Positive mass attracts both other positive masses and negative masses.
# <math>A</math> is a G<sub>δ</sub> subset of <math>\mathcal{X}</math>
* Negative mass repels both other negative masses and positive masses.
# There is a [[Metric (mathematics)|metric]] <math>\sigma</math> on <math>A</math> which is [[Metric_(mathematics)#Equivalence_of_metrics|equivalent]] to <math>\rho | A</math> such that <math>(A,\sigma)</math> is a complete metric space.


A key property of <math>G_\delta</math> sets is that they are the possible sets at which a function from a topological space to a metric space is [[continuous function|continuous]]. Formally: The set of points where a function <math>f</math> is continuous is a <math>G_\delta</math> set. This is because continuity at a point <math>p</math> can be defined by a <math>\Pi^0_2</math> formula, namely: For all positive integers <math>n</math>, there is an open set <math>U</math> containing <math>p</math> such that <math>d(f(x),f(y)) < 1/n</math> for all <math>x, y</math> in <math>U</math>. If a value of <math>n</math> is fixed, the set of <math>p</math> for which there is such a corresponding open <math>U</math> is itself an open set (being a union of open sets), and the [[universal quantifier]] on <math>n</math> corresponds to the (countable) intersection of these sets. In the real line, the converse holds as well; for any G<sub>δ</sub> subset ''A'' of the real line, there is a function ''f'': '''R''' → '''R''' which is continuous exactly at the points in ''A''. As a consequence, while it is possible for the irrationals to be the set of continuity points of a function (see the [[popcorn function]]), it is impossible to construct a function which is continuous only on the rational numbers.
For two positive masses, nothing changes and there is a gravitational pull on each other causing an attraction. Two negative masses would repel because of their negative inertial masses. For different signs however, there is a push that repels the positive mass from the negative mass, and a pull that attracts the negative mass towards the positive one at the same time.


===Basic properties===
Hence Bondi pointed out that two objects of equal and opposite mass would produce a constant acceleration of the system towards the positive-mass object,<ref name="Bondi 1957" /> an effect called "runaway motion" by Bonnor who disregarded its physical existence, stating:
* The [[complement (set theory)|complement]] of a G<sub>δ</sub> set is an [[Fσ set|F<sub>σ</sub>]] set.
{{Centered pull quote
|I regard the runaway (or self-accelerating) motion […] so preposterous that I prefer to rule it out by supposing that inertial mass is all positive or all negative.
|author= William B. Bonnor
|source=in ''Negative mass in general relativity''.<ref name="Bonnor 1989" />}}


* The intersection of countably many G<sub>δ</sub> sets is a G<sub>δ</sub> set, and the union of ''finitely'' many G<sub>δ</sub> sets is a G<sub>δ</sub> set; a countable union of G<sub>δ</sub> sets is called a G<sub>δσ</sub> set.
Such a couple of objects would accelerate without limit (except relativistic one); however, the total mass, momentum and energy of the system would remain 0.


* In [[metrizable]] spaces, every [[closed set]] is a G<sub>δ</sub> set and, dually, every open set is an F<sub>σ</sub> set.
This behavior is completely inconsistent with a common-sense approach and the expected behaviour of 'normal' matter; but is completely mathematically consistent and introduces no violation of conservation of momentum or [[conservation of energy|energy]]. If the masses are equal in magnitude but opposite in sign, then the momentum of the system remains zero if they both travel together and accelerate together, no matter what their speed:


* A [[topological subspace|subspace]] ''A'' of a [[topologically complete]] space ''X'' is itself topologically complete if and only if ''A'' is a G<sub>δ</sub> set in ''X''.
:<math>P_{sys} = mv + (-m)v = [m+(-m)]v = 0\times v = 0.</math>


* A set that contains the intersection of a countable collection of [[dense set|dense]] open sets is called '''[[comeagre set|comeagre]]''' or '''residual.''' These sets are used to define [[generic property|generic properties]] of topological spaces of functions.
And equivalently for the [[kinetic energy]] <math>K_e</math>:


The following results regard [[Polish space]]s<ref name="Fremlin 2003">{{cite book|last=Fremlin|first=D.H.|title=Measure Theory, Volume 4|year=2003|publisher=Digital Books Logistics|location=Petersburg, England|isbn=0-9538129-4-4|pages=334–335|url=http://www.essex.ac.uk/maths/people/fremlin/mt.htm|accessdate=1 April 2011|chapter=4, General Topology}}</ref>:
:<math>K_{e\ sys} = {1 \over 2} mv^2 + {1 \over 2}(-m)v^2 = {1 \over 2}[m+(-m)]v^2 = {1 \over 2}(0)v^2 = 0</math>


* Let <math>(\mathcal{X},\mathcal{T})</math> be a [[Polish space|Polish topological space]] and let <math>G\subset\mathcal{X}</math> be a G<sub>δ</sub> set (with respect to <math>\mathcal{T}</math>). The <math>G</math> is a Polish space with respect to the [[subspace topology]] on it.
Forward extended Bondi's analysis to additional cases, and showed that even if the two masses m(-) and m(+) are not the same, the conservation laws remain unbroken. This is true even when relativistic effects are considered, so long as inertial mass, not rest mass, is equal to gravitational mass.


* Topological characterization of Polish spaces: If <math>\mathcal{X}</math> is a [[Polish space]] then it is [[Homeomorphism|homeomorphic]] to a G<sub>δ</sub> subset of a [[Compact space|compact]] [[metric space]].
This behaviour can produce bizarre results: for instance, a gas containing a mixture of positive and negative matter particles will have the positive matter portion increase in [[temperature]] without bound. However, the negative matter portion gains negative temperature at the same rate, again balancing out.  [[Geoffrey A. Landis]] pointed out other implications of Forward's analysis,<ref>{{Cite journal|first=G.|last= Landis|title=Comments on Negative Mass Propulsion|journal=J. Propulsion and Power|volume= 7|issue= 2|pages= 304 |year=1991|doi=10.2514/3.23327}}</ref> including noting that although negative mass particles would repel each other gravitationally, the [[electrostatic force]] would be attractive for like-[[charge (physics)|charges]] and repulsive for opposite charges.


==G<sub>δ</sub> space==
Forward used the properties of negative-mass matter to create the concept of [[Breakthrough Propulsion Physics Program#Diametrical|diametric drive]], a design for [[spacecraft propulsion]] using negative mass that requires no energy input and no [[Working mass|reaction mass]] to achieve arbitrarily high acceleration.
A [[Gδ space|'''G<sub>δ</sub> space''']] is a topological space in which every [[closed set]] is a G<sub>δ</sub> set ([http://www.jstor.org/stable/2317335 Johnson, 1970]).{{Citation needed|date=August 2008}} A [[normal space]] which is also a G<sub>δ</sub> space is '''[[perfectly normal space|perfectly normal]]'''. Every metrizable space is perfectly normal, and every perfectly normal space is [[completely normal]]: neither implication is reversible.
 
Forward also coined a term, "nullification" to describe what happens when ordinary matter and negative matter meet: they are expected to be able to "cancel-out" or "nullify" each other's existence. An interaction between equal quantities of positive mass matter (hence of positive energy <math>E = m c^2</math>) and negative mass matter (of negative energy <math>-E = -m c^2</math>) would release no energy, but because the only configuration of such particles that has zero momentum (both particles moving with the same velocity in the same direction) does not produce a collision, all such interactions would leave a surplus of momentum, which is classically forbidden. So once this runaway phenomenon has been revealed, the [[scientific community]] considered negative mass could not exist in the universe.
 
===Arrow of time and space inversion===
In 1970, [[Jean-Marie Souriau]] demonstrated, through the complete [[Poincaré group]] of dynamic [[group theory]], that reversing the energy of a particle (hence its mass, if the particle has one) is equal to reversing its [[arrow of time]].<ref>{{cite book |last=Souriau |first=J. M. |date=1970 |title=Structure des Systèmes Dynamiques |url=http://www.jmsouriau.com/structure_des_systemes_dynamiques.htm |location=Paris |publisher=Dunod |page=199 |language=French |issn=0750-2435}}</ref><ref>{{cite book |last=Souriau |first=J. M. |title=Structure of Dynamical Systems |chapter=A mechanistic description of elementary particles: Inversions of space and time |location=Boston |publisher=Birkhäuser |date=1997 |isbn=978-1-4612-6692-1 |doi=10.1007/978-1-4612-0281-3_14}}</ref>
 
The universe according to [[general relativity]] is a [[Riemannian manifold]] associated to a [[metric tensor]] solution of Einstein’s field equations. In such a framework, the runaway motion prevents the existence of negative matter.<ref name="Bondi 1957" /><ref name="Bonnor 1989" />
 
Some [[bimetric theory|bimetric theories]] of the universe propose that two [[multiverse|parallel universes]] instead of one may exist with an opposite arrow of time, linked together by the [[Big Bang]] and interacting only through [[gravitation]].<ref name="Sakharov 1980">A.D. Sakharov: "Cosmological model of the Universe with a time vector inversion". ZhETF 79: 689–693 (1980); translation in JETP Lett. 52: 349–351 (1980)
</ref><ref name="Petit 1995">{{Cite doi|10.1007/BF00627375}}</ref><ref name=""Barbour 2014">{{Cite doi|10.1103/PhysRevLett.113.181101}}</ref> The universe is then described as a manifold associated to two Riemannian metrics (one with positive mass matter and the other with negative mass matter). According to group theory, the matter of the [[Topological conjugacy|conjugated]] metric would appear to the matter of the other metric as having opposite mass and arrow of time (though its [[proper time]] would remain positive). The coupled metrics have their own [[geodesic]]s and are solutions of two coupled field equations:<ref name="Petit 2014a">{{Cite doi|10.1007/s10509-014-2106-5}}</ref><ref name="Petit 2014b">{{Cite doi|10.1142/S021773231450182X}}</ref>
 
:<math>R_{\mu \nu}^{(+)} - {1 \over 2}g_{\mu \nu}\,R^{(+)} g_{\mu \nu}^{(+)} = {8 \pi G \over c^4} [ T_{\mu \nu}^{(+)} + \varphi T_{\mu \nu}^{(-)} ]</math>
 
:<math>R_{\mu \nu}^{(-)} - {1 \over 2}g_{\mu \nu}\,R^{(-)} g_{\mu \nu}^{(-)} = - {8 \pi G \over c^4} [ \phi T_{\mu \nu}^{(+)} + T_{\mu \nu}^{(-)} ]</math>
 
The [[Post-Newtonian expansion|Newtonian approximation]] then provides the following interaction laws:
* Positive mass attracts positive mass.
* Negative mass attracts negative mass.
* Positive mass and negative mass repel each other.
Those laws are different to the laws described by Bondi and Bonnor, and solve the runaway paradox. The negative matter of the coupled metric, interacting with the matter of the other metric via gravity, could be an alternate candidate for the explanation of [[dark matter]], [[dark energy]], [[Inflation (cosmology)|cosmic inflation]] and [[accelerating universe]].<ref name="Petit 2014a" /><ref name="Petit 2014b" />
 
===In Gauss's law for gravity===
In [[electromagnetism]] one can derive the energy density of a field from [[Gauss's law]], assuming the curl of the field is 0. Performing the same calculation using [[Gauss's law for gravity]] produces a negative energy density for a gravitational field.
 
===Gravitational interaction of antimatter===
{{Main|Gravitational interaction of antimatter}}
The overwhelming consensus among physicists is that [[antimatter]] has positive mass and should be affected by gravity just like normal matter. Direct experiments on neutral [[antihydrogen]] have not detected any difference between the gravitational interaction of antimatter, compared to normal matter.<ref>{{cite doi|10.1038/ncomms2787}}</ref>
 
[[Bubble chamber]] experiments provide further evidence that antiparticles have the same inertial mass as their normal counterparts. In these experiments, the chamber is subjected to a constant magnetic field that causes charged particles to travel in [[helical]] paths, the radius and direction of which correspond to the ratio of electric charge to inertial mass. Particle–antiparticle pairs are seen to travel in helices with opposite directions but identical radii, implying that the ratios differ only in sign; but this does not indicate whether it is the charge or the inertial mass that is inverted. However, particle–antiparticle pairs are observed to electrically attract one another. This behavior implies that both have positive inertial mass and opposite charges; if the reverse were true, then the particle with positive inertial mass would be repelled from its antiparticle partner.
 
==In quantum mechanics==
 
In 1928, [[Paul Dirac]]'s theory of [[elementary particle]]s, now part of the [[Standard Model]], already included negative solutions.<ref name="Dirac 1928">{{Cite doi|10.1098/rspa.1928.0023}}</ref> The [[Standard Model]] is a generalization of [[quantum electrodynamics]] (QED) and negative mass is already built into the theory.
 
[[Mike Morris (physicist)|Morris]], [[Kip Thorne|Thorne]] and Yurtsever<ref>{{cite journal|url=http://prola.aps.org/abstract/PRL/v61/i13/p1446_1 |doi=10.1103/PhysRevLett.61.1446|title=Wormholes, Time Machines, and the Weak Energy Condition|journal=Physical Review|volume=61|issue=13|date=September 1988|pages= 1446–1449|last1=Morris|first1=Michael|last2=Thorne|first2=Kip|last3=Yurtsever|first3=Ulvi|pmid=10038800|bibcode = 1988PhRvL..61.1446M }}</ref> pointed out that the quantum mechanics of the [[Casimir effect]] can be used to produce a locally mass-negative region of space–time.  In this article, and subsequent work by others, they showed that negative matter could be used to stabilize a [[wormhole]]. Cramer ''et al.'' argue that such wormholes might have been created in the early universe, stabilized by negative-mass loops of [[cosmic string]].<ref>{{cite journal |title=Natural Wormholes as Gravitational Lenses|journal=Phys. Rev. D|volume=51|year=1995|pages= 3117–3120|arxiv=astro-ph/9409051 |doi=10.1103/PhysRevD.51.3117 |last1=Cramer |first1=John |last2=Forward |first2=Robert |last3=Morris |first3=Michael |last4=Visser |first4=Matt |last5=Benford |first5=Gregory |last6=Landis |first6=Geoffrey |issue=6|bibcode = 1995PhRvD..51.3117C }}</ref> [[Stephen Hawking]] has proved that [[negative energy]] is a necessary condition for the creation of a [[closed timelike curve]] by manipulation of gravitational fields within a finite region of space;<ref name="futureofspacetime">{{Cite book| last = Hawking | first = Stephen | title = The Future of Spacetime | publisher = W. W. Norton |year= 2002 | pages = 96 | isbn = 0-393-02022-3}}</ref> this proves, for example, that a finite [[Tipler cylinder]] cannot be used as a [[Time travel|time machine]].
 
===Schrödinger equation===
For energy eigenstates of the [[Schrödinger equation]], the wavefunction is wavelike wherever the particle's energy is greater than the local potential, and exponential-like (evanescent) wherever it is less. Naively, this would imply kinetic energy is negative in evanescent regions (to cancel the local potential). However, kinetic energy is an operator in [[quantum mechanics]], and its expectation value is always positive, summing with the expectation value of the potential energy to yield the energy eigenvalue.
 
For wavefunctions of particles with zero rest mass (such as [[photon]]s), this means that any evanescent portions of the wavefunction would be associated with a local negative mass–energy. However, the Schrödinger equation does not apply to massless particles; instead the [[Klein-Gordon equation]] is required.
 
===Negative bare mass of the electron===
 
The mass contributed to the total mass of the [[electron]] by the cloud of [[Virtual particle|virtual photons]], by [[Mass–energy equivalence|Einstein's second law]], is positive, so the [[bare mass]] of the electron is necessarily less than its [[Electron rest mass|observed mass]]. Since the virtual photons have energies greater than twice the electron mass, so they can make the [[Pair production|electron-positron pairs]] needed for charge [[renormalization]], then the bare mass of the source electron must be negative.<ref name="Woodward 1993">{{Cite doi|10.1007/BF00665728}}</ref><ref name="Woodward 1994">{{Cite doi|10.1007/BF02056552}}</ref><ref name="Woodward book">{{Cite doi|10.1007/978-1-4614-5623-0}}</ref>


==See also==
==See also==
* [[Fσ set|F<sub>σ</sub> set]], the [[duality (mathematics)|dual]] concept; note that "G" is German (''[[wikt:Gebiet#German|Gebiet]]'') and "F" is French (''[[wikt:fermé#French|fermé]]'').
* [[Exotic matter]]
* [[Alcubierre drive]]
* [[Warp-field experiments]]
* [[Woodward effect]]


==References==
==References==
* [[John L. Kelley]], ''General topology'', [[Van Nostrand Reinhold|van Nostrand]], 1955.  P.134.
{{Reflist}}
* {{Cite book | last1=Steen | first1=Lynn Arthur | author1-link=Lynn Arthur Steen | last2=Seebach | first2=J. Arthur Jr. | author2-link=J. Arthur Seebach, Jr. | title=[[Counterexamples in Topology]] | origyear=1978 | publisher=[[Springer-Verlag]] | location=Berlin, New York | edition=[[Dover Publications|Dover]] reprint of 1978 | isbn=978-0-486-68735-3 | mr=507446  | year=1995 | postscript=<!-- Bot inserted parameter. Either remove it; or change its value to "." for the cite to end in a ".", as necessary. -->{{inconsistent citations}}}}  P. 162.
{{Use dmy dates|date=September 2010}}
* {{Cite book | last=Fremlin | first=D.H. | title=Measure Theory, Volume 4 | origyear=2003 | publisher=Digital Books Logostics | location=Petersburg, England | isbn=0-9538129-4-4  | year=2003 | url=http://www.essex.ac.uk/maths/people/fremlin/mt.htm|accessdate=1 April 2011|chapter=4, General Topology | postscript=<!-- Bot inserted parameter. Either remove it; or change its value to "." for the cite to end in a ".", as necessary. -->{{inconsistent citations}}}}  P. 334.
* Roy A. Johnson (1970). "A Compact Non-Metrizable Space Such That Every Closed Subset is a G-Delta". ''The American Mathematical Monthly'', Vol. 77, No. 2, pp.&nbsp;172–176. [http://www.jstor.org/stable/2317335 on JStor]
 
==Notes==
<references />
 
{{DEFAULTSORT:Gδ Set}}
[[Category:General topology]]
[[Category:Descriptive set theory]]


[[ja:Gδ集合]]
{{DEFAULTSORT:Negative Mass}}
[[pl:Zbiór typu G-delta]]
[[Category:Mass]]
[[Category:Gravitation]]
[[Category:Wormhole theory]]
[[Category:Warp drive theory]]
[[Category:Exotic matter]]
[[Category:Hypothetical objects]]

Revision as of 03:33, 11 August 2014

In theoretical physics, negative mass is a hypothetical concept of matter whose mass is of opposite sign to the mass of normal matter, e.g. −2 kg. Such matter would violate one or more energy conditions and show some strange properties, stemming from the ambiguity as to whether attraction should refer to force or the oppositely oriented acceleration for negative mass. It is used in certain speculative theories, such as on the construction of wormholes. The closest known real representative of such exotic matter is a region of pseudo-negative pressure density produced by the Casimir effect. Although general relativity well describes the laws of motion for both positive and negative energy particles, hence negative mass, it does not include the fundamental forces other than gravitation. Whereas the Standard Model which describes elementary particles does not encompass gravitation, which is yet intimately involved in the origin of mass and inertia. Thus a correct particle model should explicitly include gravity.

In general relativity

Negative mass is generalized to refer to any region of space in which for some observers the mass density is measured to be negative. This could occur due a region of space in which the stress component of the Einstein stress–energy tensor is larger in magnitude than the mass density. All of these are violations of one or another variant of the positive energy condition of Einstein's general theory of relativity; however, the positive energy condition is not a required condition for the mathematical consistency of the theory. Various versions of the positive energy condition, weak energy condition, dominant energy condition, etc., are discussed in mathematical detail by Matt Visser.[1]

Inertial versus gravitational

The earliest references to negative weight are due to the observation that metals gain weight when oxidizing in the study of phlogiston theory in the early 1700s.

Ever since Newton first formulated his theory of gravity, there have been at least three conceptually distinct quantities called mass: inertial mass, "active" gravitational mass (that is, the source of the gravitational field), and "passive" gravitational mass (that is, the mass that is evident from the force produced in a gravitational field). The Einstein equivalence principle postulates that inertial mass must equal passive gravitational mass. The law of conservation of momentum requires that active and passive gravitational mass be identical. All experimental evidence to date has found these are, indeed, always the same. In considering negative mass, it is important to consider which of these concepts of mass are negative. In most analyses of negative mass, it is assumed that the equivalence principle and conservation of momentum continue to apply, and therefore all three forms of mass are still the same.

In his first prize essay for the 1951 Gravity Research Foundation competition, Joaquin Mazdak Luttinger considered the possibility of negative mass and how it would behave under gravitational and other forces.[2]

In 1957, following Luttinger's idea, Hermann Bondi suggested in a paper in Reviews of Modern Physics that mass might be negative as well as positive.[3] He pointed out that this does not entail a logical contradiction, as long as all three forms of mass are negative, but that the assumption of negative mass involves some counter-intuitive form of motion. For example, an object with negative inertial mass would be expected to accelerate in the opposite direction to that in which it was pushed.

There have been several other analyses of negative mass, for example R.H. Price,[4] however none addressed the question of what kind of energy and momentum would be necessary to describe non-singular negative mass. Indeed, the Schwarzschild solution for negative mass parameter has a naked singularity at a fixed spatial position. The question that immediately comes up is, would it not be possible to smooth out the singularity with some kind of negative mass density. The answer is yes, but not with energy and momentum that satisfies the dominant energy condition. This is because if the energy and momentum satisfies the dominant energy condition within a spacetime that is asymptotically flat, which would be the case of smoothing out the singular negative mass Schwarzschild solution, then it must satisfy the positive energy theorem, i.e. its ADM mass must be positive, which is of course not the case.[5][6] However, it was noticed by Belletête and Paranjape that since the positive energy theorem does not apply to asymptotic de Sitter spacetime, it would actually be possible to smooth out, with energy-momentum that does satisfy the dominant energy condition, the singularity of the corresponding exact solution of negative mass Schwarzschild-de Sitter, which is the singular, exact solution of Einstein's equations with cosmological constant.[7] In a subsequent article, Mbarek and Paranjape showed that it is in fact possible to obtain the required deformation through the introduction of the energy-momentum of a perfect fluid.[8]

Runaway motion

Although no particles are known to have negative mass, physicists (primarily Hermann Bondi in 1957,[3] William B. Bonnor in 1989,[9] then Robert L. Forward[10]) have been able to describe some of the anticipated properties such particles may have. Assuming that all three concepts of mass are equivalent the gravitational interactions between masses of arbitrary sign can be explored, based on the Einstein field equations:

  • Positive mass attracts both other positive masses and negative masses.
  • Negative mass repels both other negative masses and positive masses.

For two positive masses, nothing changes and there is a gravitational pull on each other causing an attraction. Two negative masses would repel because of their negative inertial masses. For different signs however, there is a push that repels the positive mass from the negative mass, and a pull that attracts the negative mass towards the positive one at the same time.

Hence Bondi pointed out that two objects of equal and opposite mass would produce a constant acceleration of the system towards the positive-mass object,[3] an effect called "runaway motion" by Bonnor who disregarded its physical existence, stating: SINGAPORE – Real property brokers are more and more turning from the as soon as-lucrative resale market to leases, as they hunt for a residing to protect their careers and purchasers during what is anticipated to be one other challenging yr for the industry.

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Such a couple of objects would accelerate without limit (except relativistic one); however, the total mass, momentum and energy of the system would remain 0.

This behavior is completely inconsistent with a common-sense approach and the expected behaviour of 'normal' matter; but is completely mathematically consistent and introduces no violation of conservation of momentum or energy. If the masses are equal in magnitude but opposite in sign, then the momentum of the system remains zero if they both travel together and accelerate together, no matter what their speed:

And equivalently for the kinetic energy :

Forward extended Bondi's analysis to additional cases, and showed that even if the two masses m(-) and m(+) are not the same, the conservation laws remain unbroken. This is true even when relativistic effects are considered, so long as inertial mass, not rest mass, is equal to gravitational mass.

This behaviour can produce bizarre results: for instance, a gas containing a mixture of positive and negative matter particles will have the positive matter portion increase in temperature without bound. However, the negative matter portion gains negative temperature at the same rate, again balancing out. Geoffrey A. Landis pointed out other implications of Forward's analysis,[11] including noting that although negative mass particles would repel each other gravitationally, the electrostatic force would be attractive for like-charges and repulsive for opposite charges.

Forward used the properties of negative-mass matter to create the concept of diametric drive, a design for spacecraft propulsion using negative mass that requires no energy input and no reaction mass to achieve arbitrarily high acceleration.

Forward also coined a term, "nullification" to describe what happens when ordinary matter and negative matter meet: they are expected to be able to "cancel-out" or "nullify" each other's existence. An interaction between equal quantities of positive mass matter (hence of positive energy ) and negative mass matter (of negative energy ) would release no energy, but because the only configuration of such particles that has zero momentum (both particles moving with the same velocity in the same direction) does not produce a collision, all such interactions would leave a surplus of momentum, which is classically forbidden. So once this runaway phenomenon has been revealed, the scientific community considered negative mass could not exist in the universe.

Arrow of time and space inversion

In 1970, Jean-Marie Souriau demonstrated, through the complete Poincaré group of dynamic group theory, that reversing the energy of a particle (hence its mass, if the particle has one) is equal to reversing its arrow of time.[12][13]

The universe according to general relativity is a Riemannian manifold associated to a metric tensor solution of Einstein’s field equations. In such a framework, the runaway motion prevents the existence of negative matter.[3][9]

Some bimetric theories of the universe propose that two parallel universes instead of one may exist with an opposite arrow of time, linked together by the Big Bang and interacting only through gravitation.[14][15]Cite error: Invalid <ref> tag; invalid names, e.g. too many The universe is then described as a manifold associated to two Riemannian metrics (one with positive mass matter and the other with negative mass matter). According to group theory, the matter of the conjugated metric would appear to the matter of the other metric as having opposite mass and arrow of time (though its proper time would remain positive). The coupled metrics have their own geodesics and are solutions of two coupled field equations:[16][17]

The Newtonian approximation then provides the following interaction laws:

  • Positive mass attracts positive mass.
  • Negative mass attracts negative mass.
  • Positive mass and negative mass repel each other.

Those laws are different to the laws described by Bondi and Bonnor, and solve the runaway paradox. The negative matter of the coupled metric, interacting with the matter of the other metric via gravity, could be an alternate candidate for the explanation of dark matter, dark energy, cosmic inflation and accelerating universe.[16][17]

In Gauss's law for gravity

In electromagnetism one can derive the energy density of a field from Gauss's law, assuming the curl of the field is 0. Performing the same calculation using Gauss's law for gravity produces a negative energy density for a gravitational field.

Gravitational interaction of antimatter

Mining Engineer (Excluding Oil ) Truman from Alma, loves to spend time knotting, largest property developers in singapore developers in singapore and stamp collecting. Recently had a family visit to Urnes Stave Church. The overwhelming consensus among physicists is that antimatter has positive mass and should be affected by gravity just like normal matter. Direct experiments on neutral antihydrogen have not detected any difference between the gravitational interaction of antimatter, compared to normal matter.[18]

Bubble chamber experiments provide further evidence that antiparticles have the same inertial mass as their normal counterparts. In these experiments, the chamber is subjected to a constant magnetic field that causes charged particles to travel in helical paths, the radius and direction of which correspond to the ratio of electric charge to inertial mass. Particle–antiparticle pairs are seen to travel in helices with opposite directions but identical radii, implying that the ratios differ only in sign; but this does not indicate whether it is the charge or the inertial mass that is inverted. However, particle–antiparticle pairs are observed to electrically attract one another. This behavior implies that both have positive inertial mass and opposite charges; if the reverse were true, then the particle with positive inertial mass would be repelled from its antiparticle partner.

In quantum mechanics

In 1928, Paul Dirac's theory of elementary particles, now part of the Standard Model, already included negative solutions.[19] The Standard Model is a generalization of quantum electrodynamics (QED) and negative mass is already built into the theory.

Morris, Thorne and Yurtsever[20] pointed out that the quantum mechanics of the Casimir effect can be used to produce a locally mass-negative region of space–time. In this article, and subsequent work by others, they showed that negative matter could be used to stabilize a wormhole. Cramer et al. argue that such wormholes might have been created in the early universe, stabilized by negative-mass loops of cosmic string.[21] Stephen Hawking has proved that negative energy is a necessary condition for the creation of a closed timelike curve by manipulation of gravitational fields within a finite region of space;[22] this proves, for example, that a finite Tipler cylinder cannot be used as a time machine.

Schrödinger equation

For energy eigenstates of the Schrödinger equation, the wavefunction is wavelike wherever the particle's energy is greater than the local potential, and exponential-like (evanescent) wherever it is less. Naively, this would imply kinetic energy is negative in evanescent regions (to cancel the local potential). However, kinetic energy is an operator in quantum mechanics, and its expectation value is always positive, summing with the expectation value of the potential energy to yield the energy eigenvalue.

For wavefunctions of particles with zero rest mass (such as photons), this means that any evanescent portions of the wavefunction would be associated with a local negative mass–energy. However, the Schrödinger equation does not apply to massless particles; instead the Klein-Gordon equation is required.

Negative bare mass of the electron

The mass contributed to the total mass of the electron by the cloud of virtual photons, by Einstein's second law, is positive, so the bare mass of the electron is necessarily less than its observed mass. Since the virtual photons have energies greater than twice the electron mass, so they can make the electron-positron pairs needed for charge renormalization, then the bare mass of the source electron must be negative.[23][24][25]

See also

References

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  2. One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  3. 3.0 3.1 3.2 3.3 One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  4. One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  5. One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  6. One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  7. One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  8. One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  9. 9.0 9.1 Template:Cite doi
  10. Template:Cite doi
  11. One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  12. 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
  13. 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
  14. A.D. Sakharov: "Cosmological model of the Universe with a time vector inversion". ZhETF 79: 689–693 (1980); translation in JETP Lett. 52: 349–351 (1980)
  15. Template:Cite doi
  16. 16.0 16.1 Template:Cite doi
  17. 17.0 17.1 Template:Cite doi
  18. Template:Cite doi
  19. Template:Cite doi
  20. One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  21. One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  22. 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
  23. Template:Cite doi
  24. Template:Cite doi
  25. Template:Cite doi