Dans cet article, nous donnons une exposition élémentaire sur la stratification d’Alexander qui vient de deux points de vue : la cohomologie des groupes et les revêtements finis et abéliens des CW-complexes. Nous appliquons ces méthodes à l’étude des groupes qui sont isomorphes à un groupe fondamental d’une variété compacte kählérienne.
Equations defining the jumping loci for the first cohomology group of one-dimensional representations of a finitely presented group can be effectively computed using Fox calculus. In this paper, we give an exposition of Fox calculus in the language of group cohomology and in the language of finite abelian coverings of CW complexes. Work of Arapura and Simpson imply that if is the fundamental group of a compact Kähler manifold, then the strata are finite unions of translated affine subtori. It follows that for Kähler groups the jumping loci must be defined by binomial ideals. As we will show, this is not the case for general finitely presented groups. Thus, the “binomial condition” can be used as a criterion for proving certain finitely presented groups are not Kähler.
@article{AIF_1997__47_2_555_0,
author = {Hironaka, Eriko},
title = {Alexander stratifications of character varieties},
journal = {Annales de l'Institut Fourier},
pages = {555--583},
publisher = {Association des Annales de l{\textquoteright}institut Fourier},
volume = {47},
number = {2},
year = {1997},
doi = {10.5802/aif.1573},
mrnumber = {98e:14020},
zbl = {0870.57003},
language = {en},
url = {http://www.numdam.org/articles/10.5802/aif.1573/}
}
TY - JOUR AU - Hironaka, Eriko TI - Alexander stratifications of character varieties JO - Annales de l'Institut Fourier PY - 1997 SP - 555 EP - 583 VL - 47 IS - 2 PB - Association des Annales de l’institut Fourier UR - http://www.numdam.org/articles/10.5802/aif.1573/ DO - 10.5802/aif.1573 LA - en ID - AIF_1997__47_2_555_0 ER -
%0 Journal Article %A Hironaka, Eriko %T Alexander stratifications of character varieties %J Annales de l'Institut Fourier %D 1997 %P 555-583 %V 47 %N 2 %I Association des Annales de l’institut Fourier %U http://www.numdam.org/articles/10.5802/aif.1573/ %R 10.5802/aif.1573 %G en %F AIF_1997__47_2_555_0
Hironaka, Eriko. Alexander stratifications of character varieties. Annales de l'Institut Fourier, Tome 47 (1997) no. 2, pp. 555-583. doi : 10.5802/aif.1573. http://www.numdam.org/articles/10.5802/aif.1573/
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