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- W2950566308 abstract "We study the crystalline universal deformation ring R (and its ideal of reducibility I) of a mod p Galois representation rho_0 of dimension n whose semisimplification is the direct sum of two absolutely irreducible mutually non-isomorphic constituents rho_1 and rho_2. Under some assumptions on Selmer groups associated with rho_1 and rho_2 we show that R/I is cyclic and often finite. Using ideas and results of (but somewhat different assumptions from) Bellaiche and Chenevier we prove that I is principal for essentially self-dual representations and deduce statements about the structure of R. Using a new commutative algebra criterion we show that given enough information on the Hecke side one gets an R=T-theorem. We then apply the technique to modularity problems for 2-dimensional representations over an imaginary quadratic field and a 4-dimensional representation over the rationals." @default.
- W2950566308 created "2019-06-27" @default.
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- W2950566308 date "2011-03-26" @default.
- W2950566308 modified "2023-09-27" @default.
- W2950566308 title "On deformation rings of residually reducible Galois representations and R=T theorems" @default.
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