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Computations of vector-valued Siegel modular forms
Journal article   Open access   Peer reviewed

Computations of vector-valued Siegel modular forms

Alexandru Ghitza, Nathan C. Ryan and Davia W Sulon
Journal of number theory, v 133(11), pp 3921-3940
01 Nov 2013
url
https://doi.org/10.1016/j.jnt.2013.04.024View
Published, Version of Record (VoR)Maybe Open Access (Publisher Bronze) Restricted

Abstract

Science & Technology Mathematics Physical Sciences
We carry out some computations of vector-valued Siegel modular forms of degree two, weight (k, 2) and level one, and highlight three experimental results: (1) we identify a rational eigenform in a three-dimensional space of cusp forms; (2) we observe that non-cuspidal eigenforms of level one are not always rational; (3) we verify a number of cases of conjectures about congruences between classical modular forms and Siegel modular forms. Our approach is based on Satoh's description of the module of vector-valued Siegel modular forms of weight (k, 2) and an explicit description of the Hecke action on Fourier expansions. (C) 2013 Elsevier Inc. All rights reserved.

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