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Dynamical systems on measure spaces, invariant measures, ergodic averages, mixing properties.

2 votes

Density of strictly ergodic measures in the d-bar topology

The strictly ergodic measures are dense in the ergodic measures in the $\bar d$-metric. The proof (actually, a sketch of the proof) is given in Single orbit dynamics by Weiss (Theorem 4.4', page 46).
Dominik Kwietniak's user avatar
3 votes
Accepted

Reference request: shift invariant measures are (locally exactly) approximable by periodic ones

I don't know wheter this counts as standard, but... There is a paper by Krystyna Ziemian: Rotation sets for subshifts of finite type. Fund. Math. 146 (1995), no. 2, pp. 189--201 containing some …
Dominik Kwietniak's user avatar
3 votes

Is every measure-theoretic factor map between isomorphic odometers an isomorphism?

This is true, and follows from the property called coalescence. In a topological setting this definition is due to Auslander [Endomorphisms of minimal sets, Duke Math. J. Volume 30, Number 4 (1963), …
Dominik Kwietniak's user avatar
1 vote

A question about transitivity

As Lee Mosher noted if $M$ is a compact metric space, then the shift map on the product space $X=M^\mathbb{N}$ has a dense orbit and hence it is transitive. Let me add a few remarks: There are two not …
Dominik Kwietniak's user avatar
3 votes
1 answer
205 views

Automorphisms of strictly ergodic shift spaces

Let $X$ be a strictly ergodic shift space, and $\omega_1$, $\omega_2$ be two different points in $X$. Is there an automorphism $\Psi$ of $X$ such that $\Psi(\omega_1)=\omega_2$? By an automorphism I m …
Dominik Kwietniak's user avatar
7 votes
Accepted

invariant measures of the expanding maps on the circle

The proof of (2) is contained in the much more general theorem due to Sigmund. This is because the main result of Sigmund "Generic Properties Of Invariant Measures for Axiom A-Diffeomorphisms" Inventi …
Dominik Kwietniak's user avatar
12 votes
Accepted

inverse problem for ergodic measures

Let $X$ be a compact metric space and $T\colon X\to X$ be a continuous map. The set of $T$-invariant Borel probability measures $\mathcal{M}_T(X)$ is well known to be non-empty, convex, compact, and m …
Dominik Kwietniak's user avatar
4 votes

Convex combinations of Bernoulli Measures

Maybe it is good to note that a similar question: What is the weak-$^*$ closure of the set $$ D=\{\mu\in\mathcal{M}_\sigma: \mu\text{ is isomorphic to some }\nu\in C\}? $$ has a dramatically different …
Dominik Kwietniak's user avatar
6 votes
0 answers
123 views

Countable-to-one factors of measure preserving systems do not change entropy

It is known that if $\psi$ is a factor map between probability measure preserving systems $(X,\mathscr{X},\mu,T)$ and $(Y,\mathscr{Y},\nu,S)$ is countable-to-one almost everywhere, then $h(\mu,T)=h(\n …
Dominik Kwietniak's user avatar
3 votes
2 answers
173 views

a bound for Feldman's **f-bar** $\bar{f}$ metric for measures

My question regards properties of the f-bar metric $\bar{f}$ defined for shift invariant measures on $\mathscr{A}^\infty$ where $\mathscr{A}$ is a finite alphabet. The definition of the $\bar{f}$ met …
Dominik Kwietniak's user avatar
2 votes
1 answer
147 views

Does conjugacy preserve the set of synchronizing blocks?

A synchronized system is a transitive shift space $X$ which has a synchronizing block $v$, that is $v$ is an admissible block for $X$ and whenever $vw$ and $uv$ are admissible blocks in $X$, then $uvw …
Dominik Kwietniak's user avatar
2 votes
1 answer
209 views

Irrational rotations are rank 2 by intervals without spacers

Let $\alpha$ be an irrational number, and $R_\alpha$ be the rotation by $\alpha$, that is $R_\alpha(x)=x+\alpha\bmod 1$. S. Ferenczi in his survey [Systems of finite rank. Colloq. Math. 73 (1997), no. …
Dominik Kwietniak's user avatar
2 votes
2 answers
209 views

Mixing coded systems and period of their graph presentations

A coded system [see F. Blanchard, G. Hansel, Systèmes codés, Theoretical Computer Science, Vol. 44, 1986, pp. 17-49, http://dx.doi.org/10.1016/0304-3975(86)90108-8. (http://www.sciencedirect.com/scien …
Dominik Kwietniak's user avatar
6 votes
0 answers
252 views

Completeness of the space of measures under $d$-bar metric

Does anybody know the reference to a proof of the following fact (which is not hard to prove, but seems to be well-known, see here): The space of shift-invariant measures under Ornstein's d-bar metric …
Dominik Kwietniak's user avatar
7 votes
0 answers
296 views

Possible Birkhoff spectra for irrational rotations

Let $\mathbb{T}=\mathbb{R}/\mathbb{Z}$ be the unit circle (think of it as of the interval $[0,1)$ with endpoints identified). Assume that $\alpha$ is irrational and consider the rotation by $\alpha$, …
Dominik Kwietniak's user avatar

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