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Thermodynamics of the Katok map

Published online by Cambridge University Press:  28 June 2017

Y. PESIN
Affiliation:
Department of Mathematics, Pennsylvania State University, University Park, PA 16802, USA email pesin@math.psu.edu
S. SENTI
Affiliation:
Instituto de Matematica, Universidade Federal do Rio de Janeiro, CP 68 530, CEP 21945-970, R.J., Brazil email senti@im.ufrj.br
K. ZHANG
Affiliation:
Department of Mathematics, University of Toronto, Toronto, Ontario, Canada email kezhang@math.umd.edu
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Abstract

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We effect the thermodynamical formalism for the non-uniformly hyperbolic $C^{\infty }$ map of the two-dimensional torus known as the Katok map [Katok. Bernoulli diffeomorphisms on surfaces. Ann. of Math. (2)110(3) 1979, 529–547]. It is a slow-down of a linear Anosov map near the origin and it is a local (but not small) perturbation. We prove the existence of equilibrium measures for any continuous potential function and obtain uniqueness of equilibrium measures associated to the geometric $t$-potential $\unicode[STIX]{x1D711}_{t}=-t\log \mid df|_{E^{u}(x)}|$ for any $t\in (t_{0},\infty )$, $t\neq 1$, where $E^{u}(x)$ denotes the unstable direction. We show that $t_{0}$ tends to $-\infty$ as the domain of the perturbation shrinks to zero. Finally, we establish exponential decay of correlations as well as the central limit theorem for the equilibrium measures associated to $\unicode[STIX]{x1D711}_{t}$ for all values of $t\in (t_{0},1)$.

Information

Type
Original Article
Copyright
© Cambridge University Press, 2017