| HAL : hal-00086803, version 3 |
| arXiv : math/0607467 |
| DOI : 10.1214/07-AOP356 |
| Fiche détaillée | Récupérer au format |
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| Annals of Probability 36, 3 (2008) 1134-1152 |
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| Versions disponibles : | v1 (19-07-2006) | v2 (17-02-2007) | v3 (05-07-2007) |
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| Asymptotic entropy and Green speed for random walks on groups |
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| Sébastien Blachère 1Peter Haïssinsky 1 |
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| (2008) |
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| We study asymptotic properties of the Green metric associated to transient random walks on countable groups. We prove that the rate of escape of the random walk computed in the Green metric equals its asymptotic entropy. The proof relies on integral representations of both quantities with the extended Martin kernel. In the case of finitely generated groups, where this result is known (Benjamini \& Peres \cite{benjaminiperes}), we give an alternative proof relying on a version of the so-called fundamental inequality (relating the rate of escape, the entropy and the logarithmic volume growth) extended to random walks with unbounded support. |
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| 1 : | Laboratoire d'Analyse, Topologie, Probabilités (LATP) |
| CNRS : UMR6632 – Université de Provence - Aix-Marseille I – Université Paul Cézanne - Aix-Marseille III | |
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| Domaine | : | Mathématiques/Probabilités Mathématiques/Théorie des groupes |
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| Green function – Random walks on groups |
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| Liste des fichiers attachés à ce document : | ||||||||||
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| hal-00086803, version 3 | |
| http://hal.archives-ouvertes.fr/hal-00086803 | |
| oai:hal.archives-ouvertes.fr:hal-00086803 | |
| Contributeur : Peter Haïssinsky | |
| Soumis le : Jeudi 5 Juillet 2007, 14:02:49 | |
| Dernière modification le : Vendredi 13 Juin 2008, 17:54:48 | |