[Transience des variétés algébriques dans les groupes linéaires - applications à la généricité de la notion de densité Zariski]
Nous étudions la transience des variétés algébriques dans les groupes linéaires. En particulier, nous montrons qu’une marche aléatoire sur un sous-groupe non élémentaire de évite toute sous-variété algébrique propre avec une probabilité convergeant vers 1 de façon exponentielle. Nous étudions aussi le cas où la marche aléatoire vit dans un sous-groupe Zariski dense du groupe des points réels d’un groupe algébrique semi-simple, défini et déployé sur .
Nous utilisons ces résultats pour montrer qu’un sous-groupe aléatoire (en un sens à préciser) d’un groupe algébrique est Zariski dense.
We study the transience of algebraic varieties in linear groups. In particular, we show that a “non elementary” random walk in escapes exponentially fast from every proper algebraic subvariety. We also treat the case where the random walk takes place in the real points of a semisimple split algebraic group and show such a result for a wide family of random walks.
As an application, we prove that generic subgroups (in some sense) of linear groups are Zariski dense.
Keywords: transience, algebraic varieties, Zariski density, random matrix products, random walks, probability of return
Mots-clés : propriétés génériques des groupes linéaires, marches aléatoires sur les groupes, produits de matrices aléatoires, sous-variétés des groupes algébriques linéaires
Aoun, Richard 1
@article{AIF_2013__63_5_2049_0, author = {Aoun, Richard}, title = {Transience of algebraic varieties in linear groups - applications to generic {Zariski} density}, journal = {Annales de l'Institut Fourier}, pages = {2049--2080}, publisher = {Association des Annales de l{\textquoteright}institut Fourier}, volume = {63}, number = {5}, year = {2013}, doi = {10.5802/aif.2822}, mrnumber = {3203113}, zbl = {06284540}, language = {en}, url = {https://aif.centre-mersenne.org/articles/10.5802/aif.2822/} }
TY - JOUR AU - Aoun, Richard TI - Transience of algebraic varieties in linear groups - applications to generic Zariski density JO - Annales de l'Institut Fourier PY - 2013 SP - 2049 EP - 2080 VL - 63 IS - 5 PB - Association des Annales de l’institut Fourier UR - https://aif.centre-mersenne.org/articles/10.5802/aif.2822/ DO - 10.5802/aif.2822 LA - en ID - AIF_2013__63_5_2049_0 ER -
%0 Journal Article %A Aoun, Richard %T Transience of algebraic varieties in linear groups - applications to generic Zariski density %J Annales de l'Institut Fourier %D 2013 %P 2049-2080 %V 63 %N 5 %I Association des Annales de l’institut Fourier %U https://aif.centre-mersenne.org/articles/10.5802/aif.2822/ %R 10.5802/aif.2822 %G en %F AIF_2013__63_5_2049_0
Aoun, Richard. Transience of algebraic varieties in linear groups - applications to generic Zariski density. Annales de l'Institut Fourier, Tome 63 (2013) no. 5, pp. 2049-2080. doi : 10.5802/aif.2822. https://aif.centre-mersenne.org/articles/10.5802/aif.2822/
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