On the rapid decay of cuspidal automorphic forms

Details On the rapid decay of cuspidal automorphic forms On the rapid decay of cuspidal automorphic forms

2011-06-10

arxiv.org/abs/1106.2149v1

Mathematics

Number Theory

35 pages, 1 figure

Scientific paper

Many important analytic statements about automorphic forms, such as the analytic continuation of certain L-functions, rely on the well-known rapid decay of K-finite cusp forms on Siegel sets. We extend this here to prove a more general decay statement along sets much larger than Siegel sets, and furthermore state and prove the decay for smooth but not necessarily K-finite cusp forms. We also state a general theorem about the convergence of Rankin-Selberg integrals involving unipotent periods, closing a gap in the literature on L-functions. These properties serve as the analytic basis of a new method to establish holomorphic continuations of Langlands L-functions, in particular the exterior square L-functions on GL(n). Keywords: Automorphic forms, rapid decay, cusp forms, L-functions, Rankin-Selberg, integral representations, uniform moderate growth.

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