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Title: Do nuclear collisions create a locally equilibrated quark–gluon plasma?

Experimental results on azimuthal correlations in high energy nuclear collisions (nucleus–nucleus, proton–nucleus, and proton–proton) seem to be well described by viscous hydrodynamics. It is often argued that this agreement implies either local thermal equilibrium or at least local isotropy. In this note, I present arguments why this is not the case. Neither local near-equilibrium nor near-isotropy are required in order for hydrodynamics to offer a successful and accurate description of experimental results. However, I predict the breakdown of hydrodynamics at momenta of order seven times the temperature, corresponding to a smallest possible QCD liquid drop size of 0.15 fm.
Authors:
 [1]
  1. Univ. of Colorado, Boulder, CO (United States). Dept. of Physics. Center for Theory of Quantum Matter
Publication Date:
Grant/Contract Number:
SC0008132
Type:
Published Article
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 77; Journal Issue: 1; Journal ID: ISSN 1434-6044
Publisher:
Springer
Research Org:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1338664
Alternate Identifier(s):
OSTI ID: 1368404

Romatschke, P. Do nuclear collisions create a locally equilibrated quark–gluon plasma?. United States: N. p., Web. doi:10.1140/epjc/s10052-016-4567-x.
Romatschke, P. Do nuclear collisions create a locally equilibrated quark–gluon plasma?. United States. doi:10.1140/epjc/s10052-016-4567-x.
Romatschke, P. 2017. "Do nuclear collisions create a locally equilibrated quark–gluon plasma?". United States. doi:10.1140/epjc/s10052-016-4567-x.
@article{osti_1338664,
title = {Do nuclear collisions create a locally equilibrated quark–gluon plasma?},
author = {Romatschke, P.},
abstractNote = {Experimental results on azimuthal correlations in high energy nuclear collisions (nucleus–nucleus, proton–nucleus, and proton–proton) seem to be well described by viscous hydrodynamics. It is often argued that this agreement implies either local thermal equilibrium or at least local isotropy. In this note, I present arguments why this is not the case. Neither local near-equilibrium nor near-isotropy are required in order for hydrodynamics to offer a successful and accurate description of experimental results. However, I predict the breakdown of hydrodynamics at momenta of order seven times the temperature, corresponding to a smallest possible QCD liquid drop size of 0.15 fm.},
doi = {10.1140/epjc/s10052-016-4567-x},
journal = {European Physical Journal. C, Particles and Fields},
number = 1,
volume = 77,
place = {United States},
year = {2017},
month = {1}
}