Do nuclear collisions create a locally equilibrated quark-gluon plasma?

被引：78

作者：

Romatschke, P. ^{[1
,2
]}

机构：

[1] Univ Colorado Boulder, Dept Phys, 390 UCB, Boulder, CO 80309 USA

[2] Univ Colorado, Ctr Theory Quantum Matter, Boulder, CO 80309 USA

来源：

EUROPEAN PHYSICAL JOURNAL C | 2017年 / 77卷 / 01期

关键词：

STATISTICAL HADRONIZATION; TRANSVERSE-MOMENTUM; FLOW; SPECTRA; HADRONS; PB;

D O I：

10.1140/epjc/s10052-016-4567-x

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

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.

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