Escape rates and conditionally invariant measures

Mark F. Demers, Lai Sang Young

Research output: Contribution to journalArticlepeer-review


We consider dynamical systems on domains that are not invariant under the dynamics - for example, a system with a hole in the phase space - and raise issues regarding the meaning of escape rates and conditionally invariant measures. Equating observable events with sets of positive Lebesgue measure, we are led quickly to conditionally invariant measures that are absolutely continuous with respect to Lebesgue. Comparisons with SRB measures are inevitable, yet there are important differences. Via informal discussions and examples, this paper seeks to clarify the ideas involved. It includes also a brief review of known results and possible directions of further work in this developing subject.

Original languageEnglish (US)
Pages (from-to)377-397
Number of pages21
Issue number2
StatePublished - Feb 1 2006

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics
  • General Physics and Astronomy
  • Applied Mathematics


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