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

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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.

References

Primary source

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

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