Geometric Thermodynamical Formalism and Real Analyticity for Meromorphic Functions of Finite Order

Details Geometric Thermodynamical Formalism and Real Analyticity for Meromorphic Functions of Finite Order Geometric Thermodynamical Formalism and Real Analyticity for Meromorphic Functions of Finite Order

2006-06-13

arxiv.org/abs/math/0606294v2

Mathematics

Dynamical Systems

32 pages

Scientific paper

Working with well chosen Riemannian metrics and employing Nevanlinna's theory, we make the thermodynamical formalism work for a wide class of hyperbolic meromorphic functions of finite order (including in particular exponential family, elliptic functions, cosine, tangent and the cosine--root family and also compositions of these functions with arbitrary polynomials). In particular, the existence of conformal (Gibbs) measures is established and then the existence of probability invariant measures equivalent to conformal measures is proven. As a geometric consequence of the developed thermodynamic formalism, a version of Bowen's formula expressing the Hausdorff dimension of the radial Julia set as the zero of the pressure function and, moreover, the real analyticity of this dimension, is proved.

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