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Equality of pressures for rational functions

Published online by Cambridge University Press:  04 May 2004

FELIKS PRZYTYCKI
Affiliation:
Institute of Mathematics Polish Academy of Sciences, ul. Śniadeckich 8, 00950 Warszawa, Poland (e-mail: feliksp@impan.gov.pl)
JUAN RIVERA-LETELIER
Affiliation:
Departamento de Matematica, Universidad Católica del Norte, Casilla 1280, Antofagasta, Chile (e-mail: rivera-letelier@ucn.cl)
STANISLAV SMIRNOV
Affiliation:
Department of Mathematics, Royal Institute of Technology, Stockholm 10044, Sweden (e-mail: stas@math.kth.se)

Abstract

We prove that for all rational functions f on the Riemann sphere and potential $-t\ln|f'|, t\ge 0$ all the notions of pressure introduced in Przytycki (Proc. Amer. Math. Soc.351(5) (1999), 2081–2099) coincide. In particular, we get a new simple proof of the equality between the hyperbolic Hausdorff dimension and the minimal exponent of conformal measure on a Julia set. We prove that these pressures are equal to the pressure defined with the use of periodic orbits under an assumption that there are not many periodic orbits with Lyapunov exponent close to 1 moving close together, in particular under the Topological Collet–Eckmann condition. In Appendix A, we discuss the case t < 0.

Type
Research Article
Copyright
2004 Cambridge University Press

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