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Title: Nonequilibrium fixed points in longitudinally expanding scalar theories: Infrared cascade, Bose condensation and a challenge for kinetic theory

Journal Article · · Physical Review. D, Particles, Fields, Gravitation and Cosmology
 [1];  [2];  [3];  [2]
  1. Univ. Heidelberg, Heidelberg (Germany); ExtreMe Matter Institute (EMMI), GSI Helmholtzzentrum fur Schwerionenforschung GmbH, Darmstadt (Germany)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Univ. Heidelberg, Heidelberg (Germany)

In [Phys. Rev. Lett. 114, 061601 (2015)], we reported on a new universality class for longitudinally expanding systems, encompassing strongly correlated non-Abelian plasmas and N-component self-interacting scalar field theories. Using classical-statistical methods, we showed that these systems share the same self-similar scaling properties for a wide range of momenta in a limit where particles are weakly coupled but their occupancy is high. Here we significantly expand on our previous work and delineate two further self-similar regimes. One of these occurs in the deep infrared (IR) regime of very high occupancies, where the nonequilibrium dynamics leads to the formation of a Bose-Einstein condensate. The universal IR scaling exponents and the spectral index characterizing the isotropic IR distributions are described by an effective theory derived from a systematic large-N expansion at next-to-leading order. Remarkably, this effective theory can be cast as a vertex-resummed kinetic theory. The other novel self-similar regime occurs close to the hard physical scale of the theory, and sets in only at later times. In this study, we argue that the important role of the infrared dynamics ensures that key features of our results for scalar and gauge theories cannot be reproduced consistently in conventional kinetic theory frameworks.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
SC00112704; SC0012704; AC02-05CH11231
OSTI ID:
1246813
Alternate ID(s):
OSTI ID: 1225387
Report Number(s):
BNL-112019-2016-JA; PRVDAQ; R&D Project: 08870; KB0301020
Journal Information:
Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 92, Issue 9; ISSN 1550-7998
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

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Cited By (9)

Kinetic theory of nonthermal fixed points in a Bose gas journal April 2019
Highly occupied gauge theories in 2 + 1 dimensions: A self-similar attractor journal November 2019
Nonthermal fixed points in quantum field theory beyond the weak-coupling limit journal February 2017
Particle yields from numerical simulations journal April 2018
Large- N kinetic theory for highly occupied systems journal June 2018
Nonthermal fixed points in quantum field theory beyond the weak-coupling limit text January 2017
Prescaling and far-from-equilibrium hydrodynamics in the quark-gluon plasma journal January 2021
Nonlinear dynamics from the relativistic Boltzmann equation in the Friedmann-Lemaître-Robertson-Walker spacetime text January 2016
Particle yields from numerical simulations text January 2017

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