Markov Extensions and Conditionally Invariant Measures for Certain Logistic Maps with Small Holes

Details Markov Extensions and Conditionally Invariant Measures for Certain Logistic Maps with Small Holes Markov Extensions and Conditionally Invariant Measures for Certain Logistic Maps with Small Holes

2004-04-13

arxiv.org/abs/math/0404256v2

Ergod. Th. and Dynam. Sys. 25:4 (2005), 1139-1171

Mathematics

Dynamical Systems

35 pages. New version contains mainly minor revisions with some clarification of the arguments

Scientific paper

We study the family of quadratic maps f_a(x) = 1 - ax^2 on the interval [-1,1] with a between 0 and 2. When small holes are introduced into the system, we prove the existence of an absolutely continuous conditionally invariant measure using the method of Markov extensions. The measure has a density which is bounded away from zero and is analogous to the density for the corresponding closed system. These results establish the exponential escape rate of Lebesgue measure from the system, despite the contraction in a neighborhood of the critical point of the map. We also prove convergence of the conditionally invariant measure to the SRB measure for f_a as the size of the hole goes to zero.

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