Toric complexes and Artin kernels

Details Toric complexes and Artin kernels Toric complexes and Artin kernels

2008-01-23

arxiv.org/abs/0801.3626v2

Advances in Mathematics 220 (2009), no. 2, 441-477

Mathematics

Algebraic Topology

34 pages

Scientific paper

10.1016/j.aim.2008.09.008

A simplicial complex L on n vertices determines a subcomplex T_L of the n-torus, with fundamental group the right-angled Artin group G_L. Given an epimorphism \chi\colon G_L\to \Z, let T_L^\chi be the corresponding cover, with fundamental group the Artin kernel N_\chi. We compute the cohomology jumping loci of the toric complex T_L, as well as the homology groups of T_L^\chi with coefficients in a field \k, viewed as modules over the group algebra \k\Z. We give combinatorial conditions for H_{\le r}(T_L^\chi;\k) to have trivial \Z-action, allowing us to compute the truncated cohomology ring, H^{\le r}(T_L^\chi;\k). We also determine several Lie algebras associated to Artin kernels, under certain triviality assumptions on the monodromy \Z-action, and establish the 1-formality of these (not necessarily finitely presentable) groups.

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