Applications of (a,b)-continued fraction transformations

Details Applications of (a,b)-continued fraction transformations Applications of (a,b)-continued fraction transformations

2011-05-30

arxiv.org/abs/1105.6133v1

Mathematics

Dynamical Systems

accepted for publication, Ergodic Theory and Dynamical Systems

Scientific paper

We describe a general method of arithmetic coding of geodesics on the modular surface based on a two parameter family of continued fraction transformations studied previously by the authors. The finite rectangular structure of the attractors of the natural extension maps and the corresponding "reduction theory" play an essential role. In special cases, when an (a,b)-expansion admits a so-called "dual", the coding sequences are obtained by juxtaposition of the boundary expansions of the fixed points, and the set of coding sequences is a countable sofic shift. We also prove that the natural extension maps are Bernoulli shifts and compute the density of the absolutely continuous invariant measure and the measure-theoretic entropy of the one-dimensional map.

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