Serre weights for rank two unitary groups
Serre weights for rank two unitary groups
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二级酉群的 Serre 权重
DOI:
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发表时间:
2011
期刊:
影响因子:
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通讯作者:
D. Geraghty
中科院分区:
文献类型:
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作者:
Thomas Barnet;Toby Gee;D. Geraghty
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 innovations are the use of outer forms of $$ ext{ GL}_2$$ to avoid the parity difficulties with inner forms, and the use of the lifting techniques and “change of weight” results introduced in Barnet-Lamb et al. [J Am Math Soc 24(2):411–469, 2011; Duke Math J 161(8):1521–1580, 2012; Potential automorphy and change of weight, Preprint, 2010].