Strengthened large deviations for rational maps and full shifts, with unified proof

TL;DR

This paper establishes a unified proof for strong large deviation principles in hyperbolic rational maps and full shifts, providing explicit rate functions and new entropy expressions, applicable to various dynamical systems.

Contribution

It introduces a unified proof technique for large deviations in hyperbolic rational maps and full shifts, with explicit rate functions and entropy formulas, extending previous results.

Findings

Strong large deviation principles proved for rational maps and full shifts.

Explicit rate functions for the large deviation principles derived.

New expressions for entropy of invariant measures provided.

Abstract

For any hyperbolic rational map and any net of Borel probability measures on the space of Borel probability measures on the Julia set, we show that this net satisfies a strong form of the large deviation principle with a rate function given by the entropy map if and only if the large deviation and the pressure functionals coincide. To each such principles corresponds a new expression for the entropy of invariant measures. We give the explicit form of the rate function of the corresponding large deviation principle in the real line for the net of image measures obtained by evaluating the function $\log|T'|$. These results are applied to various examples including those considered in the literature where only upper bounds have been proved. The proof rests on some entropy-approximation property (independent of the net of measures), which in a suitable formulation, is nothing but the hypothesis involving exposed points in Baldi's theorem. In particular, it works verbatim for general dynamical systems. After stating the corresponding general version, as another example we consider the multidimensional full shift for which the above property has been recently proved, and we establish large deviation principles for nets of measures analogous to those of the rational maps case.