Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8897057 | Journal of Number Theory | 2018 | 27 Pages |
Abstract
Let X be a smooth projective algebraic variety over a number field F, with an embedding Ï:FâªC. The action of Gal(F¯/F) on â-adic cohomology groups Heti(X/F¯,Qâ), induces Galois representations Ïâi:Gal(F¯/F)âGL(Heti(X/F¯,Qâ)). Fix a non-archimedean valuation v on F, of residual characteristic p. Let Fv be the completion of F at v and â²Wv be the Weil-Deligne group of Fv. We establish new cases, for which the linear representations Ïâi_ of â²Wv, associated to Ïâi, form a compatible system of representations of â²Wv defined over Q. Under suitable hypotheses, we show that in some cases, these representations actually form a compatible system of representations of â²Wv, with values in the Mumford-Tate group of HBi(ÏX(C),Q). When X has good reduction at v, we establish a motivic relationship between the compatibility of the system {Ïâi}ââ p and the conjugacy class of the crystalline Frobenius of the reduction of X at v.
Keywords
Related Topics
Physical Sciences and Engineering
Mathematics
Algebra and Number Theory
Authors
Abhijit Laskar,