“…• As for regularity issues (curvature and distortion bounds, absolute continuity), it may be missleading that properties similar to our requirements automatically hold in the general framework of Pesin and Katok-Strelcyn theory, see [7] and [13]. Nonetheless, in our setting it is crucial to have uniform control of curvatures, distortions and holonomies on the phase space.…”
Abstract. We prove exponential decay of correlations for a "reasonable" class of multi-dimensional dispersing billiards. The scatterers are required to be C 3 smooth, the horizon is finite, there are no corner points. In addition, we assume subexponential complexity of the singularity set.
“…• As for regularity issues (curvature and distortion bounds, absolute continuity), it may be missleading that properties similar to our requirements automatically hold in the general framework of Pesin and Katok-Strelcyn theory, see [7] and [13]. Nonetheless, in our setting it is crucial to have uniform control of curvatures, distortions and holonomies on the phase space.…”
Abstract. We prove exponential decay of correlations for a "reasonable" class of multi-dimensional dispersing billiards. The scatterers are required to be C 3 smooth, the horizon is finite, there are no corner points. In addition, we assume subexponential complexity of the singularity set.
“…Pour certains ouverts convexes il existe des trajectoires du billiard qui ne sont pas définies pour tout temps t: la série des temps successifs entre rebonds converge (voir [7]). Cependant l'ensemble de tels points est de mesure nulle pour la mesure de Liouville (voir [10]j, on peut définir presque partout un flot (€?<) sur B(îî), laissant invariant la projection À sur B(0) de la mesure de Liouville À; par définition îî est un billiard ergodique si le système dynamique (B(îî), ((?<), A) l'est. Comme ((?<) n'est pas continu en général, il est délicat de traduire le théorème 4 de propagation en termes de mesures invariantes par le flot du billiard, c'est pourquoi nous introduirons plus loin une classe particulière de mesures sur 9^.S*(î. Jx Jx où h = -r_ est continue > 0 sur X. Notre théorème 1 découle alors du résultat général suivant:…”
Section: Mesures Invariantes Sur Des Billîards Convexesunclassified
“…Pesin first proved general results concerning the existence of families of stable manifolds and their absolute continuity (see [14]) and deduced therefrom the formula. Later, results were generalized to deterministic dynamical systems preserving only a Borel measure (see [18], [7]) and for dynamical systems with singularities (see [9]). In [4] one finds a comprehensive and self-contained account on the theory dynamical systems with nonvanishing Lyapunov exponents, i.e.…”
Pesin's formula relates the entropy of a dynamical system with its positive Lyapunov exponents. It is well known, that this formula holds true for random dynamical systems on a compact Riemannian manifold with invariant probability measure which is absolutely continuous with respect to the Lebesgue measure. We will show that this formula remains true for random dynamical systems on R d which have an invariant probability measure absolutely continuous to the Lebesgue measure on R d . Finally we will show that a broad class of stochastic flows on R d of a Kunita type satisfies Pesin's formula.
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