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Image of Λ-adic Galois representations modulo p

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http://link.springer.com/article/10.1007/s00222-012-0439-7/fulltext.html
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Abstract

Let p≥5 be a prime. If an irreducible component of the spectrum of the 'big' ordinary Hecke algebra does not have complex multiplication, under mild assumptions, we prove that the image of its mod p Galois representation contains an open subgroup of [InlineEquation not available: see fulltext.] for the canonical "weight" variable T. This fact appears to be deep, as it is almost equivalent to the vanishing of the μ-invariant of the Kubota-Leopoldt p-adic L-function and the anticyclotomic Katz p-adic L-function. Another key ingredient of the proof is the anticyclotomic main conjecture proven by Rubin/Mazur-Tilouine. © 2012 Springer-Verlag Berlin Heidelberg.

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