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Rationality questions and motives of cubic fourfolds

Rationality questions and motives of cubic fourfolds

In this note we propose an approach to some questions about the birational geometry of smooth cubic fourfolds through the theory of Chow motives. We introduce the transcendental part t(X) of the motive of X and prove that it is isomorphic to the (twisted) transcendental part h tr 2 (F …