Finite generation of Tate cohomology

Details Finite generation of Tate cohomology Finite generation of Tate cohomology

2008-04-26

arxiv.org/abs/0804.4246v5

Representation theory, 15 (2011) 244-257

Mathematics

Representation Theory

14 pages, to appear in "Representation theory" (AMS Journal)

Scientific paper

Let G be a finite group and let k be a field of characteristic p. Given a finitely generated indecomposable non-projective kG-module M, we conjecture that if the Tate cohomology $\HHHH^*(G, M)$ of G with coefficients in M is finitely generated over the Tate cohomology ring $\HHHH^*(G, k)$, then the support variety V_G(M) of M is equal to the entire maximal ideal spectrum V_G(k). We prove various results which support this conjecture. The converse of this conjecture is established for modules in the connected component of k in the stable Auslander-Reiten quiver for kG, but it is shown to be false in general. It is also shown that all finitely generated kG-modules over a group G have finitely generated Tate cohomology if and only if G has periodic cohomology.

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