A1 Journal article (refereed)
Unraveling the nature of universal dynamics in O(N) theories (2020)

Boguslavski, K., & Orioli, A. P. (2020). Unraveling the nature of universal dynamics in O(N) theories. Physical Review D, 101(9), Article 091902. https://doi.org/10.1103/PhysRevD.101.091902

JYU authors or editors

Publication details

All authors or editors: Boguslavski, Kirill; Orioli, Asier Piñeiro

Journal or series: Physical Review D

ISSN: 2470-0010

eISSN: 2470-0029

Publication year: 2020

Volume: 101

Issue number: 9

Article number: 091902

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevD.101.091902

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/69658

Publication is parallel published: https://arxiv.org/abs/1911.04506


Many-body quantum systems far from equilibrium can exhibit universal scaling dynamics which defy standard classification schemes. Here, we disentangle the dominant excitations in the universal dynamics of highly occupied N-component scalar systems using unequal-time correlators. While previous equal-time studies have conjectured the infrared properties to be universal for all N, we clearly identify for the first time two fundamentally different phenomena relevant at different N. We find all N >= 3 to be indeed dominated by the same Lorentzian "large-N" peak, whereas N = 1 is characterized instead by a non-Lorentzian peak with different properties, and for N = 2, we see a mixture of two contributions. Our results represent a crucial step toward obtaining a classification scheme of universality classes far from equilibrium.

Free keywords: bose gases; fluctuation theorems; quasiparticles; collective excitations; scaling laws of complex systems; nonequilibrium systems; phase space methods

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2020

JUFO rating: 2

Last updated on 2021-20-09 at 15:35