Locally potentially equivalent Galois representations

Details Locally potentially equivalent Galois representations Locally potentially equivalent Galois representations

2010-10-26

arxiv.org/abs/1010.5393v1

Mathematics

Number Theory

11 pages

Scientific paper

We show that if two continuous semi-simple \(\ell \)-adic Galois representations are locally potentially equivalent at a sufficiently large set of places then they are globaly potentially equivalent. We also prove an analogous result for arbitrarily varying powers of character values evaluated at the Frobenius conjugacy classes. In the context of modular forms, we prove: given two non-CM newforms $f$ and $g$ of weight at least two, such that $a_p(f)^{n_p}=a_p(g)^{n_p}$ on a set of primes of positive upper density and for some set of natural numbers $n_p$, then $f$ and $g$ are twists of each other by a Dirichlet character.

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