q-Deformed Statistical-Mechanical Property in the Dynamics of Trajectories en route to the Feigenbaum Attractor

TL;DR

This paper reveals that the dynamics leading to the Feigenbaum attractor can be described by a q-deformed statistical-mechanical framework, linking trajectory convergence to multifractal thermodynamics and universal constants.

Contribution

It introduces a novel q-deformed statistical-mechanical model for the Feigenbaum attractor dynamics, detailing the trajectory behavior and thermodynamic structure at the transition to chaos.

Findings

Convergence rates are described by a q-entropy linked to the attractor's geometry.

The q-indices are determined by universal constants of unimodal maps.

The thermodynamic structure relates to multifractal properties of the attractor.

Abstract

We demonstrate that the dynamics towards and within the Feigenbaum attractor combine to form a q-deformed statistical-mechanical construction. The rate at which ensemble trajectories converge to the attractor (and to the repellor) is described by a q-entropy obtained from a partition function generated by summing distances between neighboring positions of the attractor. The values of the q-indices involved are given by the unimodal map universal constants, while the thermodynamic structure is closely related to that formerly developed for multifractals. As an essential component in our demonstration we expose, at a previously unknown level of detail, the features of the dynamics of trajectories that either evolve towards the Feigenbaum attractor or are captured by its matching repellor. The dynamical properties of the family of periodic superstable cycles in unimodal maps are seen to be key ingredients for the comprehension of the discrete scale invariance features present at the period-doubling transition to chaos. We make clear the dynamical origin of the anomalous thermodynamic framework existing at the Feigenbaum attractor.