Geodesic
Motivic splitting lemma
Documenta mathematica, Tome 13 (2008), pp. 81-96.

Voir la notice de l'article provenant de la source Electronic Library of Mathematics

Summary: Let $M$ be a Chow motive over a field $F$. Let $X$ be a smooth projective variety over $F$ and $N$ be a direct summand of the motive of $X$. Assume that over the generic point of $X$ the motives $M$ and $N$ become isomorphic to a direct sum of twisted Tate motives. The main result of the paper says that if a morphism $f: M \to N$ splits over the generic point of $X$ then it splits over $F$, i.e., $N$ is a direct summand of $M$. We apply this result to various examples of motives of projective homogeneous varieties.
Keywords: Chow motive, homogeneous variety 
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     title = {Motivic splitting lemma},
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Vishik, A.; Zainoulline, K. Motivic splitting lemma. Documenta mathematica, Tome 13 (2008), pp. 81-96. http://geodesic.mathdoc.fr/item/DOCMA_2008__13__a20/