Extended equivariant Picard complexes and homogeneous spaces

Details Extended equivariant Picard complexes and homogeneous spaces Extended equivariant Picard complexes and homogeneous spaces

2010-10-17

arxiv.org/abs/1010.3414v3

Mathematics

Algebraic Geometry

32 pages. Final version, to appear in Transformation Groups

Scientific paper

Let k be a field of characteristic 0 and let X be a smooth geometrically integral k-variety. In our previous paper we defined the extended Picard complex UPic(X) as a certain complex of Galois modules in degrees 0 and 1. We computed the isomorphism class of UPic(G) in the derived category of Galois modules for a connected linear k-group G. In this paper we assume that X is a homogeneous space of a connected linear k-group G with geometric stabilizer H. We compute the isomorphism class of UPic(X) in the derived category of Galois modules in terms of the character groups of G and H. The proof is based on the notion of the extended equivariant Picard complex UPic_G(X) of a G-variety X.

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