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Let $M$ be a closed manifold, $m$ be the normalized volume measure on $M$, and $f:M\to M$ be a $C^2$ transitive Anosov diffeomorphism. Consider the pushforward $f^km$ defined by

----------$f^km(A):=m(f^{-k}A)$ for all measurable subset $A\subset M$.

Then the Birkhoff averages $\nu_k=\frac{1}{k}\sum_{j=0}^{k-1}f^jm$ are probability measures on $M$ for all $k\ge1$. The question is:

• What can we say about the measure(s) in the set $\mathcal{V}(m)$ of accumulation points of $[\nu_k:k\ge1]$?\{\nu_k:k\ge1\}$? We know that there exists a unique SRB measure$\mu_+$for$f$(and a unique SRB measure$\mu_-$for$f^{-1}$). Do we have$\mathcal{V}(m)\subset[\mu_+,\mu_-]$? (Here [ ] should be { }. Thank you all~)\mathcal{V}(m)\subset\{\mu_+,\mu_-\}$?

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# Accumulation points of the Birkhoff average of $m$

Let $M$ be a closed manifold, $m$ be the normalized volume measure on $M$, and $f:M\to M$ be a $C^2$ transitive Anosov diffeomorphism. Consider the pushforward $f^km$ defined by

----------$f^km(A):=m(f^{-k}A)$ for all measurable subset $A\subset M$.

Then the Birkhoff averages $\nu_k=\frac{1}{k}\sum_{j=0}^{k-1}f^jm$ are probability measures on $M$ for all $k\ge1$. The question is:

• What can we say about the measure(s) in the set $\mathcal{V}(m)$ of accumulation points of $[\nu_k:k\ge1]$?

We know that there exists a unique SRB measure $\mu_+$ for $f$ (and a unique SRB measure $\mu_-$ for $f^{-1}$). Do we have $\mathcal{V}(m)\subset[\mu_+,\mu_-]$?

(Here [ ] should be { }. Thank you all~)