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PERIOD IDENTITIES OF CM FORMS ON QUATERNION ALGEBRAS

Part of: Discontinuous groups and automorphic forms Algebraic number theory: global fields

Published online by Cambridge University Press:  20 May 2020

CHARLOTTE CHAN
CHARLOTTE CHAN*
Affiliation:
Department of Mathematics, University of Michigan, 530 Church St., Ann Arbor 48109, USA; charchan@umich.edu

Abstract

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Waldspurger’s formula gives an identity between the norm of a torus period and an $L$-function of the twist of an automorphic representation on GL(2). For any two Hecke characters of a fixed quadratic extension, one can consider the two torus periods coming from integrating one character against the automorphic induction of the other. Because the corresponding $L$-functions agree, (the norms of) these periods—which occur on different quaternion algebras—are closely related. In this paper, we give a direct proof of an explicit identity between the torus periods themselves.

MSC classification

Primary: 11F67: Special values of automorphic $L$-series, periods of modular forms, cohomology, modular symbols 11F27: Theta series; Weil representation; theta correspondences 11R52: Quaternion and other division algebras
Type
Number Theory
Information
Forum of Mathematics, Sigma , Volume 8 , 2020 , e25
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author 2020

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