Reduction mod p of Cuspidal Representations of GL(2,q) and Symmetric Powers

Details Reduction mod p of Cuspidal Representations of GL(2,q) and Symmetric Powers Reduction mod p of Cuspidal Representations of GL(2,q) and Symmetric Powers

2009-09-07

arxiv.org/abs/0909.1359v1

Journal of Algebra 324 (2010), pp. 3507-3531

Mathematics

Representation Theory

25 pages

Scientific paper

We show the existence of integral models for cuspidal representations of GL(2,q), whose reduction modulo p can be identified with the cokernel of a differential operator on F_{q}[X,Y] defined by J-P. Serre. These integral models come from the crystalline cohomology of the projective curve XY^{q}-X^{q}Y-Z^{q+1}=0. As an application, we can extend a construction of C. Khare and B. Edixhoven (2003) giving a cohomological analogue of the Hasse invariant operator acting on spaces of modp modular forms for GL(2).

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