Document Type

Article

Publication Date

8-2010

Keywords

Eigenforms, Hecke operators

Abstract

It is well known that newforms of integral weight are simultaneous eigenforms for all the Hecke operators, and that the converse is not true. In this paper, we give a characterization of all simultaneous Hecke eigenforms associated to a given newform, and provide several applications. These include determining the number of linearly independent simultaneous eigenforms in a fixed space which correspond to a given newform, and characterizing several situations in which the full space of cusp forms is spanned by a basis consisting of such eigenforms. Part of our results can be seen as a generalization of results of Choie-Kohnen who considered diagonalization of “bad” Hecke operators on spaces with square free level and trivial character. Of independent interest, but used herein, is a lower bound for the dimension of the space of newforms with arbitrary character.

Publication Title

International Journal of Number Theory

Volume

6

Issue

5

First Page

1117

Last Page

1137

DOI

https://doi.org/10.1142/S1793042110003411

Required Publisher's Statement

Preprint of an article published in International Journal of Number Theory, Volume 06, Issue 05, 2010, 1117-1137, https://doi.org/10.1142/S1793042110003411, © copyright World Scientific Publishing Company,https://www.worldscientific.com/toc/ijnt/06/05

Genre/Form

articles

Type

Text

Rights

Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this document for commercial purposes, or for financial gain, shall not be allowed without the author’s written permission.

Rights Statement

http://rightsstatements.org/vocab/InC/1.0/

Language

English

Format

application/pdf

Included in

Mathematics Commons

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