Tate's correspondence conjecture for isomorphic two-dimensional Galois representations

Let X1X_1 and X2X_2 be varieties defined over Q\mathbb{Q}, and let ρ1\rho_1 and ρ2\rho_2 be isomorphic two-dimensional Galois representations occurring in their étale cohomology. A correspondence between X1X_1 and X2X_2 is an algebraic cycle on X1×X2X_1\times X_2; it is defined over Q\mathbb{Q} when the cycle is defined over Q\mathbb{Q}. The Tate conjecture. If ρ1\rho_1 and ρ2\rho_2 are isomorphic, there should be a correspondence between X1X_1 and X2X_2 defined over Q\mathbb{Q} that induces an isomorphism between ρ1\rho_1 and ρ2\rho_2. This predicts that isomorphisms between Galois-representation pieces of the étale cohomology of varieties have a geometric realization by algebraic cycles defined over the ground field. The source formulates the claim as the Tate conjecture and gives no resolution evidence here.

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Primary source

S. Cynk and C. Meyer, “Modular Calabi-Yau threefolds of level eight”, arXiv:math/0504070 (2005).

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