Hyperbolic beta integrals

Details Hyperbolic beta integrals Hyperbolic beta integrals

2003-03-14

arxiv.org/abs/math/0303178v2

Mathematics

Quantum Algebra

35 pages. Remarks and references to recent new developments are added. To appear in Adv. Math

Scientific paper

Hyperbolic beta integrals are analogues of Euler's beta integral in which the role of Euler's gamma function is taken over by Ruijsenaars' hyperbolic gamma function. They may be viewed as $(q,\widetilde{q})$-bibasic analogues of the beta integral in which the two bases $q$ and $\widetilde{q}$ are interrelated by modular inversion, and they entail $q$-analogues of the beta integral for $|q|=1$. The integrals under consideration are the hyperbolic analogues of the Ramanujan integral, the Askey-Wilson integral and the Nassrallah-Rahman integral. We show that the hyperbolic Nassrallah-Rahman integral is a formal limit case of Spiridonov's elliptic Nassrallah-Rahman integral.

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