Ranks of Selmer groups in an analytic family

Details Ranks of Selmer groups in an analytic family Ranks of Selmer groups in an analytic family

2009-06-08

arxiv.org/abs/0906.1275v1

Mathematics

Number Theory

31 pages

Scientific paper

We study the variation of the dimension of the Bloch-Kato Selmer group of a p-adic Galois representation of a number field that varies in a refined family. We show that, if one restricts ourselves to representations that are, at every place dividing $p$, crystalline, non-critically refined, and with a fixed number of non-negative Hodge-Tate weights, then the dimension of the Selmer group varies essentially lower-semi-continuously. This allows to prove lower bounds for Selmer groups "by continuity", in particular to prove some predictions of the conjecture of Bloch-Kato for modular forms.

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