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May 30, 2017 at 12:53 vote accept MathsStudent
May 30, 2017 at 9:57 answer added Olivier timeline score: 4
May 30, 2017 at 5:55 comment added MathsStudent Thanks but in case 1, the local Galois representation of $f$ at $\ell$ is not irreducible ("principal series") and for $f \otimes \chi$, the local Galois representation at $\ell$ is becoming irreducible ("supercuspidal") where as after twisting by $\chi$ the local Galois representation at $\ell$, I was thinking, should still be diagonal ("ramified principal series")? Sorry I am still confused.
May 29, 2017 at 15:29 comment added Olivier The Galois representation attached to a twist of a modular form is the twist of the Galois representation (more generally, that is a big part of the internal compatibility required of the Global Langlands Correspondence). This answers all your questions and more.
May 29, 2017 at 12:42 history edited Myshkin CC BY-SA 3.0
+ top level tag (nt.)
May 29, 2017 at 12:28 review First posts
May 29, 2017 at 12:42
May 29, 2017 at 12:22 history asked MathsStudent CC BY-SA 3.0