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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).
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 …
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), …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
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. …
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 …
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 …
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 $\alpha$, …