Dénombrement des géodésiques fermées sur certaines variétés avec pointes
Marche de Markov sur le semi-groupe des contractions de
Iterated Function Systems and Spectral Decomposition of the Associated Markov Operator
Vitesse de convergence dans le théorème du renouvellement
Marches de Markov sur le semi-groupe des contractions de . Cas de la marche aléatoire à pas markoviens sur avec chocs élastiques sur les axes
Asymptotic laws for geodesic homology on hyperbolic manifolds with cusps
We consider a large class of non compact hyperbolic manifolds with cusps and we prove that the winding process generated by a closed -form supported on a neighborhood of a cusp , satisfies a limit theorem, with an asymptotic stable law and a renormalising factor depending only on the rank of the cusp and the Poincaré exponent of . No assumption on the value of is required and this theorem generalises previous results due to Y. Guivarc’h, Y. Le Jan, J. Franchi and N. Enriquez.
Stochastic dynamical systems with weak contractivity properties I. Strong and local contractivity
Consider a proper metric space and a sequence of i.i.d. random continuous mappings → . It induces the stochastic dynamical system (SDS) starting at x ∈ . In this and the subsequent paper, we study existence and uniqueness of invariant measures, as well as recurrence and ergodicity of this process. In the present first part, we elaborate, improve and complete the unpublished work of Martin Benda on local contractivity, which merits publicity and provides an important tool for studying stochastic...
Stochastic dynamical systems with weak contractivity properties II. Iteration of Lipschitz mappings
In this continuation of the preceding paper (Part I), we consider a sequence of i.i.d. random Lipschitz mappings → , where is a proper metric space. We investigate existence and uniqueness of invariant measures, as well as recurrence and ergodicity of the induced stochastic dynamical system (SDS) starting at x ∈ . The main results concern the case when the associated Lipschitz constants are log-centered. Principal tools are local contractivity, as considered in detail in Part I, the Chacon-Ornstein...
Groupes du ping-pong et géodésiques fermées en courbure -1
Nous considérons une famille de groupes libres et discrets d’isométries orientées agissant sur la boule hyperbolique et contenant des transformations paraboliques; nous démontrons que le nombre de géodésiques fermées de de longueur au plus est équivalent à , où désigne l’exposant critique de la série de Poincaré.
Homologie des géodésiques fermées sur des variétés hyperboliques avec bouts cuspidaux
A Local Limit Theorem on the Semi-Direct Product of and
A local limit theorem on the semi-direct product of and
Local limit theorems on some non unimodular groups.
Let Gd be the semi-direct product of R*+ and Rd, d ≥ 1 and let us consider the product group Gd,N = Gd x RN, N ≥ 1. For a large class of probability measures μ on Gd,N, one prove that there exists ρ(μ) ∈ ]0,1] such that the sequence of finite measures {(n(N+3)/2 / ρ(μ)n) μ*n}...
On the rate of convergence in the weak invariance principle for dependent random variables with applications to Markov chains
We prove an invariance principle for non-stationary random processes and establish a rate of convergence under a new type of mixing condition. The dependence is exponentially decaying in the gap between the past and the future and is controlled by an assumption on the characteristic function of the finite-dimensional increments of the process. The distinctive feature of the new mixing condition is that the dependence increases exponentially in the dimension of the increments. The proposed mixing...
Étude asymptotique d'une marche aléatoire centrifuge
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