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Zéro-cycles sur les fibrations au-dessus d'une courbe de genre quelconque

Published 10 Oct 2010 in math.AG and math.NT | (1010.1883v5)

Abstract: Let X be a smooth and proper variety over a number field k. Conjectures on the image of the Chow group of zero-cycles of X in the product of the corresponding groups over all completions of k were put forward by Colliot-Th\'el`ene, Kato and Saito. We prove these conjectures for the total space of fibrations, over curves with finite Tate-Shafarevich group, into rationally connected varieties which satisfy weak approximation, under an abelianness assumption on the singular fibers. ---- Soit X une vari\'et\'e propre et lisse sur un corps de nombres k. Des conjectures sur l'image du groupe de Chow des z\'ero-cycles de X dans le produit des m^emes groupes sur tous les compl\'et\'es de k ont \'et\'e propos\'ees par Colliot-Th\'el`ene, Kato et Saito. Nous d\'emontrons ces conjectures pour l'espace total de fibrations en vari\'et\'es rationnellement connexes v\'erifiant l'approximation faible, au-dessus de courbes dont le groupe de Tate-Shafarevich est fini, sous une hypoth`ese d'ab\'elianit\'e sur les fibres singuli`eres.

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