Even Galois Representations and the Fontaine-Mazur Conjecture

Details Even Galois Representations and the Fontaine-Mazur Conjecture Even Galois Representations and the Fontaine-Mazur Conjecture

2009-07-20

arxiv.org/abs/0907.3427v3

Mathematics

Number Theory

Revised Version

Scientific paper

We prove some cases of the Fontaine-Mazur conjecture for even Galois representations. In particular, we prove, under mild hypotheses, that there are no irreducible two-dimensional ordinary even Galois representations of $\Gal(\Qbar/\Q)$ with distinct Hodge-Tate weights. If $K/\Q$ is an imaginary quadratic field, we also prove (again, under certain hypotheses) that $\Gal(\Qbar/K)$ does not admit irreducible two-dimensional ordinary Galois representations of non-parallel weight. Finally, we prove that any weakly compatible family of two dimensional irreducible Galois representations of $\Gal(\Qbar/\Q)$ is, up to twist, either modular or finite.

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