Tate's correspondence conjecture for isomorphic two-dimensional Galois representations
Let and be varieties defined over , and let and be isomorphic two-dimensional Galois representations occurring in their étale cohomology. A correspondence between and is an algebraic cycle on ; it is defined over when the cycle is defined over . The Tate conjecture. If and are isomorphic, there should be a correspondence between and defined over that induces an isomorphism between and . 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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