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Periodic approximation of Lyapunov exponents for Banach cocycles

Published online by Cambridge University Press:  20 June 2017

BORIS KALININ  and
VICTORIA SADOVSKAYA
BORIS KALININ
Affiliation:
Department of Mathematics, The Pennsylvania State University, University Park, PA 16802, USA email [email protected], [email protected]
VICTORIA SADOVSKAYA
Affiliation:
Department of Mathematics, The Pennsylvania State University, University Park, PA 16802, USA email [email protected], [email protected]
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Abstract

We consider group-valued cocycles over dynamical systems. The base system is a homeomorphism $f$ of a metric space satisfying a closing property, for example a hyperbolic dynamical system or a subshift of finite type. The cocycle $A$ takes values in the group of invertible bounded linear operators on a Banach space and is Hölder continuous. We prove that upper and lower Lyapunov exponents of $A$ with respect to an ergodic invariant measure $\unicode[STIX]{x1D707}$ can be approximated in terms of the norms of the values of $A$ on periodic orbits of $f$. We also show that these exponents cannot always be approximated by the exponents of $A$ with respect to measures on periodic orbits. Our arguments include a result of independent interest on construction and properties of a Lyapunov norm for the infinite-dimensional setting. As a corollary, we obtain estimates of the growth of the norm and of the quasiconformal distortion of the cocycle in terms of the growth at the periodic points of $f$.

Type
Original Article
Information
Ergodic Theory and Dynamical Systems , Volume 39 , Issue 3 , March 2019 , pp. 689 - 706
Copyright
© Cambridge University Press, 2017 

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