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Dec 9, 2018 at 16:24 comment added user130124 @François, thanks, yes that's what I was looking for!
Dec 9, 2018 at 16:22 comment added user130124 @Laurent, I did take a cursory look at that paper of Scholl's.
Dec 9, 2018 at 8:56 comment added François Brunault In fact Saito determines the char poly of $\Phi$ without any assumption on $f $.
Dec 9, 2018 at 8:38 comment added François Brunault Kato in his Astérisque paper refers to Saito (Modular forms and p-adic Hodge theory, Inventiones 1997) for this result.
Dec 9, 2018 at 7:41 comment added Laurent Berger Did you check Scholl's "Motives for modular forms", Inventiones 1990?
Dec 9, 2018 at 7:12 comment added naf My guess is that what you get from Scholl and Faltings is simply that the associated Galois representation is crystalline. What you want should follow from this and some comparison/compatibility results saying the the characteristic polynomial of the $\Phi$ operator is the same as the characteristic polynomial of $Frob_p$ acting on the l-adic representation for $l\neq p$ but I don't know a precise reference for this.
Dec 9, 2018 at 6:47 history asked user130124 CC BY-SA 4.0