Entropy, Lyapunov exponents and escape rates in open systems

Mark F. Demers, Paul Wright, Lai-Sang Young

Research output: Contribution to journalArticle

Abstract

We study the relation between escape rates and pressure in general dynamical systems with holes, where pressure is defined to be the difference between entropy and the sum of positive Lyapunov exponents. Central to the discussion is the formulation of a class of invariant measures supported on the survivor set over which we take the supremum to measure the pressure. Upper bounds for escape rates are proved for general diffeomorphisms of manifolds, possibly with singularities, for arbitrary holes and natural initial distributions, including Lebesgue and Sinai"Reulle"Bowen (SRB) measures. Lower bounds do not hold in such a generality, but for systems admitting Markov tower extensions with spectral gaps, we prove the equality of the escape rate with the absolute value of the pressure and the existence of an invariant measure realizing the escape rate, i.e. we prove a full variational principle. As an application of our results, we prove a variational principle for the billiard map associated with a planar Lorentz gas of finite horizon with holes.

Original languageEnglish (US)
Pages (from-to)1270-1301
Number of pages32
JournalErgodic Theory and Dynamical Systems
Volume32
Issue number4
DOIs
StatePublished - Aug 2012

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Escape Rate
Open systems
Open Systems
Lyapunov Exponent
Entropy
Invariant Measure
Variational Principle
Lorentz Gas
Spectral Gap
Finite Horizon
Henri Léon Lebésgue
Billiards
Diffeomorphisms
Supremum
Absolute value
Towers
Equality
Dynamical systems
Dynamical system
Singularity

ASJC Scopus subject areas

  • Mathematics(all)
  • Applied Mathematics

Cite this

Entropy, Lyapunov exponents and escape rates in open systems. / Demers, Mark F.; Wright, Paul; Young, Lai-Sang.

In: Ergodic Theory and Dynamical Systems, Vol. 32, No. 4, 08.2012, p. 1270-1301.

Research output: Contribution to journalArticle

Demers, Mark F. ; Wright, Paul ; Young, Lai-Sang. / Entropy, Lyapunov exponents and escape rates in open systems. In: Ergodic Theory and Dynamical Systems. 2012 ; Vol. 32, No. 4. pp. 1270-1301.
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