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An orthogonality relation for $\mathrm {GL}(4, \mathbb R) $ (with an appendix by Bingrong Huang)

Part of: Discontinuous groups and automorphic forms

Published online by Cambridge University Press:  07 June 2021

Dorian Goldfeld ,
Eric Stade  and
Michael Woodbury
Dorian Goldfeld
Affiliation:
Department of Mathematics, Columbia University, New York, NY10027, USA; E-mail: goldfeld@columbia.edu.
Eric Stade
Affiliation:
Department of Mathematics, University of Colorado, Bolder, CO80309, USA; E-mail: stade@colorado.edu.
Michael Woodbury
Affiliation:
Department of Mathematics, Brown University, Providence, RI02912, USA; E-mail: michael_woodbury@brown.edu.

Abstract

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Orthogonality is a fundamental theme in representation theory and Fourier analysis. An orthogonality relation for characters of finite abelian groups (now recognized as an orthogonality relation on $\mathrm {GL}(1)$) was used by Dirichlet to prove infinitely many primes in arithmetic progressions. Orthogonality relations for $\mathrm {GL}(2)$ and $\mathrm {GL}(3)$ have been worked on by many researchers with a broad range of applications to number theory. We present here, for the first time, very explicit orthogonality relations for the real group $\mathrm {GL}(4, \mathbb R)$ with a power savings error term. The proof requires novel techniques in the computation of the geometric side of the Kuznetsov trace formula.

MSC classification

Primary: 11F55: Other groups and their modular and automorphic forms (several variables)
Secondary: 11F72: Spectral theory; Selberg trace formula
Type
Number Theory
Information
Forum of Mathematics, Sigma , Volume 9 , 2021 , e47
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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