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Category Archives: examples
Alphabeta shifts
Given , the interval map given by is naturally semiconjugate to the shift . The shift space admits a natural description in terms of the lexicographic order, and another in terms of a countablestate directed graph. These have been used … Continue reading
Posted in ergodic theory, examples, Uncategorized
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Entropy of Sgap shifts
1. Sgap shifts Sgap shifts are a useful example for studying dynamics of shift spaces that are not subshifts of finite type but still exhibit some strong mixing properties. They are defined as follows: given , let be the set … Continue reading
Slowly mixing sets
There are two equivalent definitions of mixing for a measurepreserving dynamical system . One is in terms of sets: for all measurable . The other is in terms of functions: for all . In both cases one may refer to … Continue reading
Equidistribution for random rotations
Two very different types of dynamical behaviour are illustrated by a pair of very wellknown examples on the circle: the doubling map and an irrational rotation. On the unit circle in , the doubling map is given by , while … Continue reading
Posted in ergodic theory, examples, random dynamics, statistical laws
Tagged space of invariant measures
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Fubini foiled
An important issue in hyperbolic dynamics is that of absolute continuity. Suppose some neighbourhood of a smooth manifold is foliated by a collection of smooth submanifolds , where is some indexing set. (Here “smooth” may mean , or , or … Continue reading
Markov chains and mixing times (part 2 – coupling)
This week’s post continues last week’s discussion of Markov chains and mixing times, and introduces the idea of coupling as a method for estimating mixing times. We remark that some nice notes on the subject of coupling (and others) can … Continue reading
Markov chains and mixing times
Our seminar series is taking a hiatus from spectral methods for a couple weeks — these will return eventually, but in the meantime we’ll spend some time with the idea of coupling as a method for deriving statistical properties. In … Continue reading
Posted in examples, statistical laws
Tagged decay of correlations, Markov chains, PerronFrobenius, spectral methods
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Spectral methods in dynamics (part 2)
This is a continuation of the last post, which were notes from the first in a series of talks at the Houston dynamics seminar on spectral methods for transfer operators as tools to establish statistical properties of dynamical systems. This … Continue reading
Posted in ergodic theory, examples, statistical laws
Tagged interval maps, physical measures, spectral methods, transfer operator
2 Comments
A useful example for the space of ergodic measures
Last time I discussed the following three properties that may or may not be satisfied for a map on a compact metric space : (C) The set of ergodic measures is pathconnected. (D) is dense in the set of all … Continue reading