The importance of the Selberg integral

Forrester, Peter; Warnaar, S.

doi:10.1090/S0273-0979-08-01221-4

The importance of the Selberg integral
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by Peter J. Forrester and S. Ole Warnaar PDF

Bull. Amer. Math. Soc. 45 (2008), 489-534 Request permission

Abstract:

It has been remarked that a fair measure of the impact of Atle Selberg’s work is the number of mathematical terms that bear his name. One of these is the Selberg integral, an $n$-dimensional generalization of the Euler beta integral. We trace its sudden rise to prominence, initiated by a question to Selberg from Enrico Bombieri, more than thirty years after its initial publication. In quick succession the Selberg integral was used to prove an outstanding conjecture in random matrix theory and cases of the Macdonald conjectures. It further initiated the study of $q$-analogues, which in turn enriched the Macdonald conjectures. We review these developments and proceed to exhibit the sustained prominence of the Selberg integral as evidenced by its central role in random matrix theory, Calogero–Sutherland quantum many-body systems, Knizhnik–Zamolodchikov equations, and multivariable orthogonal polynomial theory.

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