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Automorphy of Symm^5(GL(2)) and base change (1208.3946v3)

Published 20 Aug 2012 in math.NT

Abstract: We prove that for any Hecke eigenform f of level 1 and arbitrary weight there is a self-dual cuspidal automorphic form $\pi$ of $GL_6(\Q)$ corresponding to $\Symm5 (f)$, i.e., such that the system of Galois representations attached to $\pi$ agrees with the 5-th symmetric power of the one attached to f. We also improve the base change result that we obtained in a previous work: for any newform f, and any totally real number field F (no extra assumptions on f or F), we prove the existence of base change relative to the extension $F/\Q$. Finally, we combine the previous results to deduce that base change also holds for $\Symm5(f)$: for any Hecke eigenform f of level 1 and any totally real number field F, the automorphic form corresponding to $\Symm5 (f)$ can be base changed to F.

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