Jacobi–Madden equation: Difference between revisions

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{{for|the variety of all ''k''-dimensional affine subspaces of a finite-dimensional vector space (a smooth finite-dimensional variety over ''k'')|affine Grassmannian (manifold)}}
 
In [[mathematics]], the term '''affine Grassmannian''' has two distinct meanings; the concept treated in this article is the '''affine Grassmannian''' of an [[algebraic group]] ''G'' over a field ''k''. It is an [[ind-scheme]] -- a limit of finite-dimensional [[scheme (mathematics)|schemes]] -- which can be thought of as a [[flag variety]] for the loop group ''G(k((t)))'' and which describes the representation theory of the [[Langlands dual]] group <sup>''L''</sup>''G'' through what is known as the [[geometric Satake correspondence]].
 
== Definition of Gr via functor of points ==
 
Let ''k'' be a field, and denote by <math>k-\mathrm{Alg}</math> and <math>\mathrm{Set}</math> the category of commutative ''k''-algebras and the category of sets respectively. Through the [[Yoneda lemma]], a scheme ''X'' over a field ''k'' is determined by its [[functor of points]], which is the functor <math>X:k-\mathrm{Alg}\to\mathrm{Set}</math> which takes ''A'' to the set ''X(A)'' of ''A''-points of ''X''. We then say that this functor is [[representable functor|representable]] by the scheme ''X''. The affine Grassmannian is a functor from ''k''-algebras to sets which is not itself representable, but which has a [[filtration (mathematics)|filtration]] by representable functors. As such, although it is not a scheme, it may be thought of as a union of schemes, and this is enough to profitably apply geometric methods to study it.
 
Let ''G'' be an algebraic group over ''k''. The '''affine Grassmannian''' Gr<sub>''G''</sub> is the functor that associates to a ''k''-algebra ''A'' the set of isomorphism classes of pairs (''E'', ''φ''), where ''E'' is a [[principal homogeneous space]] for ''G'' over Spec ''A''[<span/>[''t'']] and ''φ'' is an isomorphism, defined over Spec ''A''((''t'')), of ''E'' with the trivial ''G''-bundle ''G'' × Spec ''A''((''t'')). By the [[Beauville–Laszlo theorem]], it is also possible to specify this data by fixing an [[algebraic curve]] ''X'' over ''k'', a ''k''-point ''x'' on ''X'', and taking ''E'' to be a ''G''-bundle on ''X''<sub>''A''</sub> and ''φ'' a trivialization on (''X''&nbsp;−&nbsp;''x'')<sub>''A''</sub>. When ''G'' is a [[reductive group]], Gr<sub>''G''</sub> is in fact ind-projective, i.e., an inductive limit of projective schemes.
 
== Definition as a coset space ==
 
Let us denote by <math>\mathcal K = k((t))</math> the field of [[formal Laurent series]] over ''k'', and by <math>\mathcal O = k[[t]]</math> the ring of formal power series over ''k''. By choosing a trivialization of ''E'' over all of Spec <math>\mathcal O</math>, the set of ''k''-points of Gr<sub>''G''</sub> is identified with the coset space <math>G(\mathcal K)/G(\mathcal O)</math>.
 
==References==
*{{cite book|author=Alexander Schmitt|title=Affine Flag Manifolds and Principal Bundles|url=http://books.google.com/books?id=xrPoBAdiVdQC&pg=PA1|accessdate=1 November 2012|date=11 August 2010|publisher=Springer|isbn=978-3-0346-0287-7|pages=3–6}}
 
{{algebra-stub}}
[[Category:Algebraic geometry]]

Revision as of 02:35, 22 September 2013

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In mathematics, the term affine Grassmannian has two distinct meanings; the concept treated in this article is the affine Grassmannian of an algebraic group G over a field k. It is an ind-scheme -- a limit of finite-dimensional schemes -- which can be thought of as a flag variety for the loop group G(k((t))) and which describes the representation theory of the Langlands dual group LG through what is known as the geometric Satake correspondence.

Definition of Gr via functor of points

Let k be a field, and denote by and the category of commutative k-algebras and the category of sets respectively. Through the Yoneda lemma, a scheme X over a field k is determined by its functor of points, which is the functor which takes A to the set X(A) of A-points of X. We then say that this functor is representable by the scheme X. The affine Grassmannian is a functor from k-algebras to sets which is not itself representable, but which has a filtration by representable functors. As such, although it is not a scheme, it may be thought of as a union of schemes, and this is enough to profitably apply geometric methods to study it.

Let G be an algebraic group over k. The affine Grassmannian GrG is the functor that associates to a k-algebra A the set of isomorphism classes of pairs (E, φ), where E is a principal homogeneous space for G over Spec A[[t]] and φ is an isomorphism, defined over Spec A((t)), of E with the trivial G-bundle G × Spec A((t)). By the Beauville–Laszlo theorem, it is also possible to specify this data by fixing an algebraic curve X over k, a k-point x on X, and taking E to be a G-bundle on XA and φ a trivialization on (X − x)A. When G is a reductive group, GrG is in fact ind-projective, i.e., an inductive limit of projective schemes.

Definition as a coset space

Let us denote by the field of formal Laurent series over k, and by the ring of formal power series over k. By choosing a trivialization of E over all of Spec , the set of k-points of GrG is identified with the coset space .

References

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