Serre weights for rank two unitary groups

Details Serre weights for rank two unitary groups Serre weights for rank two unitary groups

2011-06-28

arxiv.org/abs/1106.5586v1

Mathematics

Number Theory

43 pages

Scientific paper

We study the weight part of (a generalisation of) Serre's conjecture for mod l Galois representations associated to automorphic representations on rank two unitary groups for odd primes l. We propose a conjectural set of Serre weights, agreeing with all conjectures in the literature, and under a mild assumption on the image of the mod l Galois representation we are able to show that any modular representation is modular of each conjectured weight. We make no assumptions on the ramification or inertial degrees of l. Our main innovation is to make use of the lifting techniques introduced in our recent papers.

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