Statistical analysis of complex systems with nonclassical invariant measures

TL;DR

This paper develops a novel statistical framework for complex many-body systems with nonclassical invariant measures, using solitons and the AKNS scheme to reveal rich thermodynamic behaviors and phase transitions.

Contribution

It introduces a method to construct invariant measures and thermodynamics for systems lacking classical ensembles, demonstrated on a wave propagation model with solitons.

Findings

System exhibits phase transitions in free energy landscape

Rich thermodynamic scenarios with emergent properties

Invariant measure construction for nonclassical systems

Abstract

I investigate the problem of finding a statistical description of a complex many-body system whose invariant measure cannot be constructed stemming from classical thermodynamics ensembles. By taking solitons as a reference system and by employing a general formalism based on the Ablowitz-Kaup-Newell-Segur scheme, I demonstrate how to build an invariant measure and, within a one dimensional phase space, how to develop a suitable thermodynamics. A detailed example is provided with a universal model of wave propagation, with reference to a transparent potential sustaining gray solitons. The system shows a rich thermodynamic scenario, with a free energy landscape supporting phase transitions and controllable emergent properties. I finally discuss the origin such behavior, trying to identify common denominators in the area of complex dynamics.