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Rendiconti del Seminario Matematico della Università di Padova 127 (2012) 41-55
Brownian motion, reflection groups and Tanaka formula
Nizar Demni 1, Dominique Lépingle ( ) 2
(2012)

In the setting of finite reflection groups, we prove that the projection of a Brownian motion onto a closed Weyl chamber is another Brownian motion normally reflected on the walls of the chamber. Our proof is probabilistic and the decomposition we obtain may be seen as a multidimensional extension of Tanaka's formula for linear Brownian motion. The paper is closed with a description of the boundary process through the local times at zero of the distances from the initial process to the facets.
1 :  Institut de Recherche Mathématique de Rennes (IRMAR)
CNRS : UMR6625 – Université de Rennes 1 – École normale supérieure de Cachan - ENS Cachan – Institut National des Sciences Appliquées (INSA) : - RENNES – Université de Rennes II - Haute Bretagne
2 :  Mathématiques - Analyse, Probabilités, Modélisation - Orléans (MAPMO)
Université d'Orléans – CNRS : UMR7349
Théorie ergodique
Mathématiques/Probabilités
Reflected Brownian motion – Weyl chamber – reflection groups – longest element – local time – Tanaka formula
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