Sur les espaces homog\`enes de Borovoi-Kunyavski

Abstract

We establish the Hasse principle and the weak approximation property for certain homogeneous spaces of SLn whose geometric stabilizer is of nilpotency class 2, which were constructed by Borovoi and Kunyavski. These homogeneous spaces verify thus a conjecture of Colliot-Th\'el\`ene concerning Brauer-Manin obstruction for geometrically rationally connected varieties. -- Nous \'etablissons le principe de Hasse et l'approximation faible pour certains espaces homog\`enes de SLn \`a stabilisateur g\'eom\'etrique nilpotent de classe 2, construits par Borovoi et Kunyavski. Ces espaces homog\`enes v\'erifient donc une conjecture de Colliot-Th\'el\`ene concernant l'obstruction de Brauer-Manin pour les vari\'et\'es g\'eom\'etriquement rationnellement connexes.

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