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Chapitre D'ouvrage Année : 2016

Limit directions of a vector cocycle, remarks and examples

Résumé

We study the set ${\cal D}(\Phi)$ of limit directions of a vector cocycle $(\Phi_n)$ over a dynamical system, i.e., the set of limit values of $\Phi_n(x) /\|\Phi_n(x)\|$ along subsequences such that $\|\Phi_n(x)\|$ tends to $\infty$. This notion is natural in geometrical models of dynamical systems where the phase space is fibred over a basis with fibers isomorphic to $\mathbb{R}^d$, like systems associated to the billiard in the plane with periodic obstacles. It has a meaning for transient or recurrent cocycles. Our aim is to present some results in a general context as well as for specific models for which the set of limit directions can be described. In particular we study the related question of sojourn in cones of the cocycle when the invariance principle is satisfied.
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Dates et versions

hal-00988122 , version 1 (07-05-2014)

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Jean-Pierre Conze, Stéphane Le Borgne. Limit directions of a vector cocycle, remarks and examples. Idris Assani. Ergodic theory: Advances in dynamical systems, De Gruyter, pp.14-39, 2016, 9783110460865. ⟨hal-00988122⟩
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