Journal
NUCLEAR PHYSICS A
Volume 850, Issue 1, Pages 69-109Publisher
ELSEVIER
DOI: 10.1016/j.nuclphysa.2010.11.009
Keywords
Heavy ion collisions; Color glass condensate; Thermalization; Hydrodynamics
Categories
Funding
- DOE [DE-AC02-98CH10886]
- Agence Nationale de la Recherche [ANR-06-BLAN-0285-01]
- Brookhaven National Laboratory
- Quark-Hadron Sciences at Yukawa Institute for Theoretical Physics (Kyoto University)
- Agence Nationale de la Recherche (ANR) [ANR-06-BLAN-0285] Funding Source: Agence Nationale de la Recherche (ANR)
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Quantum fluctuations are believed to play an important role in the thermalization of classical fields in inflationary cosmology but their relevance for isotropization/thermalization of the classical fields produced in heavy ion collisions is not completely understood. We consider a scalar phi(4) toy model coupled to a strong external source, like in the Color Glass Condensate description of the early time dynamics of ultrarelativistic heavy ion collisions. The leading order classical evolution of the scalar fields is significantly modified by the rapid growth of time-dependent quantum fluctuations, necessitating an all order resummation of such secular terms. We show that the resummed expressions cause the system to evolve in accordance with ideal hydrodynamics. We comment briefly on the thermalization of the quantum system and the extension of our results to a gauge theory. (C) 2010 Elsevier B.V. All rights reserved.
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