QCD equation of state and hadron resonance gas

被引：483

作者：

Huovinen, Pasi ^{[3
]}

Petreczky, Peter ^{[1
,2
]}

机构：

[1] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

[2] Brookhaven Natl Lab, RIKEN BNL Res Ctr, Upton, NY 11973 USA

[3] Goethe Univ Frankfurt, Inst Theoret Phys, D-60438 Frankfurt, Germany

来源：

NUCLEAR PHYSICS A | 2010年 / 837卷 / 1-2期

关键词：

Laticce QCD; Equation of state; Hadron resonance gas; Hydrodynamic models; CHEMICAL FREEZE-OUT; PHASE-TRANSITION; LATTICE QCD; TEMPERATURE; MODEL; THERMODYNAMICS; ENTROPY; FLOW; COLLISIONS; ORDER;

D O I：

10.1016/j.nuclphysa.2010.02.015

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We compare the trace anomaly, strangeness and baryon number fluctuations calculated in lattice QCD with expectations based on hadron resonance gas model. We find that there is a significant discrepancy between the hadron resonance gas and the lattice data. This discrepancy is largely reduced if the hadron spectrum is modified to take into account the larger values of the quark mass used in lattice calculations as well as the finite lattice spacing errors. We also give a simple parametrization of QCD equation of state, which combines hadron resonance gas at low temperatures with lattice QCD at high temperatures. We compare this parametrization with other parametrizations of the equation of state used in hydrodynamical models and discuss differences in hydrodynamic flow for different equations of state. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：26 / 53

页数：28

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