On the asymptotic measure of periodic subsystems of finite type in symbolic dynamics

Details On the asymptotic measure of periodic subsystems of finite type in symbolic dynamics On the asymptotic measure of periodic subsystems of finite type in symbolic dynamics

2008-04-16

arxiv.org/abs/0804.2551v1

Mathematics

Dynamical Systems

Companion of the paper "Poisson processes for subsystems of finite type in symbolic dynamics"

Scientific paper

Let $\Delta\subsetneq\V$ be a proper subset of the vertices $\V$ of the defining graph of an aperiodic shift of finite type $(\Sigma_{A}^{+},\S)$. Let $\Delta_{n}$ be the union of cylinders in $\Sigma_{A}^{+}$ corresponding to the points $x$ for which the first $n$-symbols of $x$ belong to $\Delta$ and let $\mu$ be an equilibrium state of a H\"older potential $\phi$ on $\Sigma_{A}^{+}$. We know that $\mu(\Delta_{n})$ converges to zero as $n$ diverges. We study the asymptotic behaviour of $\mu(\Delta_{n})$ and compare it with the pressure of the restriction of $\phi$ to $\Sigma_{\Delta}$. The present paper extends some results in \cite{CCC} to the case when $\Sigma_{\Delta}$ is irreducible and periodic. We show an explicit example where the asymptotic behaviour differs from the aperiodic case.

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