Twisting moduli for GL(2)

Bedert, B., Cooper, G., Oliver, T. and Zhang, P. 2020. Twisting moduli for GL(2). Journal of Number Theory. 217, pp. 142-162. https://doi.org/10.1016/j.jnt.2020.04.008

TitleTwisting moduli for GL(2)
TypeJournal article
AuthorsBedert, B., Cooper, G., Oliver, T. and Zhang, P.
Abstract

We prove various converse theorems for automorphic forms on \Gamma_0(N), each assuming fewer twisted functional equations than the last. We show that no twisting at all is needed for holomorphic modular forms in the case that N\in{18,20,24} - these integers are the smallest multiples of 4 or 9 not covered by earlier work of Conrey–Farmer. This development is a consequence of finding generating sets for \Gamma_0(N) such that each generator can be written as a product of special matrices. As for real-analytic Maass forms of even (resp. odd) weight we prove the analogous statement for 1\leq N\leq 12, 14\leq N\leq18 and N\in{16,18} (resp. 1\leq N\leq 12, 14\leq N\leq 18 and N\in{20,23,24}).

JournalJournal of Number Theory
Journal citation217, pp. 142-162
ISSN0022-314X
1096-1658
Year2020
PublisherElsevier
Accepted author manuscript
License
CC BY-NC-ND 4.0
File Access Level
Open (open metadata and files)
Digital Object Identifier (DOI)https://doi.org/10.1016/j.jnt.2020.04.008
Web address (URL)https://www.sciencedirect.com/science/article/abs/pii/S0022314X20301219#!
Publication dates
Published in printDec 2020
Published online19 May 2020

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