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Étude d’une transformation non uniformément hyperbolique de l’intervalle [ 0 , 1 [

Albert Raugi — 2004

Bulletin de la Société Mathématique de France

Nous étudions un exemple de transformation non uniformément hyperbolique de l’intervalle [ 0 , 1 [ . Des exemples analogues ont été étudiés par de nombreux auteurs. Notre méthode utilise une théorie spectrale, pour une classe d’opérateurs vérifiant des conditions faibles de Doeblin-Fortet, introduite dans [1]. Elle nous permet, en particulier, de donner une estimation de la vitesse de décroissance des corrélations pour des fonctions non höldériennes.

Mesures invariantes ergodiques pour des produits gauches

Albert Raugi — 2007

Bulletin de la Société Mathématique de France

Soit ( X , 𝔛 ) un espace mesurable muni d’une transformation bijective bi-mesurable τ . Soit ϕ une application mesurable de X dans un groupe localement compact à base dénombrable G . Nous notons τ ϕ l’extension de τ , induite par ϕ , au produit X × G . Nous donnons une description des mesures positives τ ϕ -invariantes et ergodiques. Nous obtenons aussi une généralisation du théorème de réduction cohomologique de O.Sarig [5] à un groupe LCD quelconque.

A probabilistic ergodic decomposition result

Albert Raugi — 2009

Annales de l'I.H.P. Probabilités et statistiques

Let ( X , 𝔛 , μ ) be a standard probability space. We say that a sub--algebra 𝔅 of 𝔛 if any regular conditional probability 𝔅 P with respect to 𝔅 and satisfies, for -almost every ∈, B 𝔅 , 𝔅 P ( x , B ) { 0 , 1 } . In this case the equality μ ( · ) = X 𝔅 P ( x , · ) μ ( d x ) , gives us an integral decomposition in “ 𝔅 -ergodic” components. For any sub--algebra 𝔅 of 𝔛 , we denote by 𝔅 ¯ the smallest sub--algebra of 𝔛 containing 𝔅 and the collection of all setsin 𝔛 satisfying()=0. We say that 𝔅 is-complete if 𝔅 = 𝔅 ¯ . Let { 𝔅 i i I } be a non-empty family of sub--algebras which decompose...

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