Atomic mass

In mathematics, a Barnes integral or Mellin–Barnes integral is a contour integral involving a product of gamma functions. They were introduced by Template:Harvs. They are closely related to generalized hypergeometric series.

The integral is usually taken along a contour which is a deformation of the imaginary axis passing to the left of all poles of factors of the form Γ(a + s) and to the right of all poles of factors of the form Γ(a − s).

Hypergeometric series

The hypergeometric function is given as a Barnes integral Template:Harv by

${}_{2}F_{1}(a,b;c;z)={\frac {\Gamma (c)}{\Gamma (a)\Gamma (b)}}{\frac {1}{2\pi i}}\int _{-i\infty }^{i\infty }{\frac {\Gamma (a+s)\Gamma (b+s)\Gamma (-s)}{\Gamma (c+s)}}(-z)^{s}\,ds.$

This equality can be obtained by moving the contour to the right while picking up the residues at s = 0, 1, 2, ... . Given proper convergence conditions, one can relate more general Barnes' integrals and generalized hypergeometric functions _pF_q in a similar way.

Barnes lemmas

The first Barnes lemma Template:Harv states

${\frac {1}{2\pi i}}\int _{-i\infty }^{i\infty }\Gamma (a+s)\Gamma (b+s)\Gamma (c-s)\Gamma (d-s)ds={\frac {\Gamma (a+c)\Gamma (a+d)\Gamma (b+c)\Gamma (b+d)}{\Gamma (a+b+c+d)}}.$

This is an analogue of Gauss's ₂F₁ summation formula, and also an extension of Euler's beta integral. The integral in it is sometimes called Barnes's beta integral.

The second Barnes lemma Template:Harv states

${\frac {1}{2\pi i}}\int _{-i\infty }^{i\infty }{\frac {\Gamma (a+s)\Gamma (b+s)\Gamma (c+s)\Gamma (1-d-s)\Gamma (-s)}{\Gamma (e+s)}}ds$

$={\frac {\Gamma (a)\Gamma (b)\Gamma (c)\Gamma (1-d+a)\Gamma (1-d+b)\Gamma (1-d+c)}{\Gamma (e-a)\Gamma (e-b)\Gamma (e-c)}}$

where e = a + b + c − d + 1. This is an analogue of Saalschütz's summation formula.

q-Barnes integrals

There are analogues of Barnes integrals for basic hypergeometric series, and many of the other results can also be extended to this case Template:Harv.

References

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