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Dimension reduction of noisy interacting systems

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journal contribution
posted on 2024-05-17, 12:11 authored by N Zagli, GA Pavliotis, V Lucarini, A Alecio
We consider a class of models describing an ensemble of identical interacting agents subject to multiplicative noise. In the thermodynamic limit, these systems exhibit continuous and discontinuous phase transitions in a, generally, nonequilibrium setting. We provide a systematic dimension reduction methodology for constructing low-dimensional, reduced-order dynamics based on the cumulants of the probability distribution of the infinite system. We show that the low-dimensional dynamics returns the correct diagnostic properties since it produces a quantitatively accurate representation of the stationary phase diagram of the system that we compare with exact analytical results and numerical simulations. Moreover, we prove that the reduced order dynamics yields also the prognostic, i.e., time-dependent properties, as it provides the correct response of the system to external perturbations. On the one hand, this validates the use of our complexity reduction methodology since it retains information not only of the invariant measure of the system but also of the transition probabilities and time-dependent correlation properties of the stochastic dynamics. On the other hand, the breakdown of linear response properties is a key signature of the occurence of a phase transition. We show that the reduced response operators capture the correct diverging resonant behavior by quantitatively assessing the singular nature of the susceptibility of the system and the appearance of a pole for real values of frequencies. Hence, this methodology can be interpreted as a low-dimensional, reduced order approach to the investigation and detection of critical phenomena in high-dimensional interacting systems in settings where order parameters are not known.

History

Author affiliation

College of Science & Engineering College of Science & Engineering/Comp' & Math' Sciences

Version

  • VoR (Version of Record)

Published in

Physical Review Research

Volume

5

Issue

1

Publisher

American Physical Society (APS)

issn

2643-1564

eissn

2643-1564

Copyright date

2023

Available date

2024-05-17

Language

en

Deposited by

Professor Valerio Lucarini

Deposit date

2024-02-26

Rights Retention Statement

  • No

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