Hecke modules and supersingular representations of U(2,1)

Details Hecke modules and supersingular representations of U(2,1) Hecke modules and supersingular representations of U(2,1)

2012-04-05

arxiv.org/abs/1204.1273v1

Mathematics

Representation Theory

58 pages

Scientific paper

Let F be a nonarchimedean local field of odd residual characteristic p. We classify finite-dimensional simple right modules for the pro-p-Iwahori-Hecke algebra $\mathcal{H}_C(G,I(1))$, where G is the unramified unitary group U(2,1)(E/F) in three variables. Using this description when C is the algebraic closure of $\mathbb{F}_p$, we define supersingular Hecke modules and show that the functor of I(1)-invariants induces a bijection between irreducible nonsupersingular mod-p representations of G and nonsupersingular simple right $\mathcal{H}_C(G,I(1))$-modules. We then use an argument of Paskunas to construct supersingular representations of G.

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