Minimum of η/s and the phase transition of the linear sigma model in the large-N limit

被引:29
|
作者
Dobado, Antonio [1 ]
Llanes-Estrada, Felipe J. [1 ]
Torres-Rincon, Juan M. [1 ]
机构
[1] Univ Complutense Madrid, Dept Fis Teor 1, E-28040 Madrid, Spain
来源
PHYSICAL REVIEW D | 2009年 / 80卷 / 11期
关键词
TRANSPORT-COEFFICIENTS; FLUIDS;
D O I
10.1103/PhysRevD.80.114015
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We reexamine the possibility of employing the viscosity over entropy density ratio as a diagnostic tool to identify a phase transition in hadron physics to the strongly coupled quark-gluon plasma and other circumstances where direct measurement of the order parameter or the free energy may be difficult. It has been conjectured that the minimum of eta/s does indeed occur at the phase transition. We now make a careful assessment in a controlled theoretical framework, the linear sigma model at large N, and indeed find that the minimum of eta/s occurs near the second-order phase transition of the model due to the rapid variation of the order parameter (here the sigma vacuum expectation value) at a temperature slightly smaller than the critical one.
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页数:18
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