Thermalization of overpopulated systems in the 2PI formalism

Thermalization of overpopulated systems in the 2PI formalism Based on the two-particle irreducible (2PI) formalism to next-to-leading order in the 1/N expansion, we study the thermalization of overpopulated systems in scalar O(N) theories with moderate coupling. We focus in particular on the growth of soft modes, and examine whether this can lead to the formation of a transient Bose-Einstein condensate (BEC) when the initial occupancy is high enough. For the value of the coupling constant used in our simulations, we find that while the system rapidly approaches the condensation threshold, the formation of a BEC is eventually hindered by particle number changing processes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

Thermalization of overpopulated systems in the 2PI formalism

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Thermalization of overpopulated systems in the 2PI formalism

Abstract

Based on the two-particle irreducible (2PI) formalism to next-to-leading order in the 1/N expansion, we study the thermalization of overpopulated systems in scalar O(N) theories with moderate coupling. We focus in particular on the growth of soft modes, and examine whether this can lead to the formation of a transient Bose-Einstein condensate (BEC) when the initial occupancy is high enough. For the value of the coupling constant used in our simulations, we find that while the system rapidly approaches the condensation threshold, the formation of a BEC is eventually hindered by particle number changing processes.
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Publisher
The American Physical Society
Copyright
Copyright © © 2017 American Physical Society
ISSN
1550-7998
eISSN
1550-2368
D.O.I.
10.1103/PhysRevD.96.036004
Publisher site
See Article on Publisher Site

Abstract

Based on the two-particle irreducible (2PI) formalism to next-to-leading order in the 1/N expansion, we study the thermalization of overpopulated systems in scalar O(N) theories with moderate coupling. We focus in particular on the growth of soft modes, and examine whether this can lead to the formation of a transient Bose-Einstein condensate (BEC) when the initial occupancy is high enough. For the value of the coupling constant used in our simulations, we find that while the system rapidly approaches the condensation threshold, the formation of a BEC is eventually hindered by particle number changing processes.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Aug 1, 2017

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