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Hecke Operators on Drinfeld Cusp Forms

Wen-Ching Winnie Li·Yotsanan Meemark
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Abstract

In this paper, we study the Drinfeld cusp forms for $Γ_1(T)$ and $Γ(T)$ using Teitelbaum's interpretation as harmonic cocycles. We obtain explicit eigenvalues of Hecke operators associated to degree one prime ideals acting on the cusp forms for $Γ_1(T)$ of small weights and conclude that these Hecke operators are simultaneously diagonalizable. We also show that the Hecke operators are not diagonalizable in general for $Γ_1(T)$ of large weights, and not for $Γ(T)$ even of small weights. The Hecke eigenvalues on cusp forms for $Γ(T)$ with small weights are determined and the eigenspaces characterized.

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Wen-Ching Winnie Li, Yotsanan Meemark. 2008-04-16. Hecke Operators on Drinfeld Cusp Forms. https://arxiv.org/abs/math/0702742

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