Phase transitions and perfectness of fluids in weakly coupled real scalar field theories

被引：31
作者：
Chen, Jiunn-Wei [1 ,2 ,3 ]
Huang, Mei [4 ]
Li, Yen-Han [1 ,2 ]
Nakano, Eiji [1 ,2 ]
Yang, Di-Lun [1 ,2 ]
机构：
[1] Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan
[2] Natl Taiwan Univ, Ctr Theoret Sci, Taipei 10617, Taiwan
[3] MIT, CTP, Cambridge, MA 02139 USA
[4] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
来源：
PHYSICS LETTERS B | 2008年 / 670卷 / 01期
关键词：
D O I：
10.1016/j.physletb.2008.10.024
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We calculate the ratio eta/s, the shear viscosity (eta) to entropy density (s), which characterizes how perfect a fluid is, in weakly coupled real scalar field theories with different types of phase transitions. The mean-field results of the eta/s behaviors agree with the empirical observations in atomic and molecular systems such as H2O, He, N, and all the matters with data available in the NIST database. These behaviors are expected to be the same in N component scalar theories with an O(N) symmetry. We speculate these eta/s behaviors are general properties of fluid shared by QCD and cold atoms. Finally, we clarify some issues regarding counterexamples of the conjectured universal bound eta/s >= 1/4 pi found in Refs. [T.D. Cohen, Phys. Rev. Lett. 99 (2007) 021602, hep-th/0702136; A. Cherman, TD. Cohen, RM. Hohler, arXiv: 0708.4201 [hep-th]; A. Dobado, F.J. Llanes-Estrada, Eur. Phys. J. C 51 (2007) 913, hep-th/0703132] (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：18 / 21
页数：4
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