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

Jiunn Wei Chen, Mei Huang, Yen Han Li, Eiji Nakano, Di-Lun Yang

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We calculate the ratio η / s, the shear viscosity (η) 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 η / s behaviors agree with the empirical observations in atomic and molecular systems such as H 2 O, 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 η / 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 η / s ≥ 1 / 4 π found in Refs. [T.D. Cohen, Phys. Rev. Lett. 99 (2007) 021602, hep-th/0702136; A. Cherman, T.D. Cohen, P.M. Hohler, arXiv: 0708.4201 [hep-th]; A. Dobado, F.J. Llanes-Estrada, Eur. Phys. J. C 51 (2007) 913, hep-th/0703132].

Original languageEnglish
Pages (from-to)18-21
Number of pages4
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume670
Issue number1
DOIs
Publication statusPublished - 2008 Dec 4
Externally publishedYes

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scalars
fluids
quantum chromodynamics
viscosity
entropy
shear
symmetry
atoms

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Phase transitions and perfectness of fluids in weakly coupled real scalar field theories. / Chen, Jiunn Wei; Huang, Mei; Li, Yen Han; Nakano, Eiji; Yang, Di-Lun.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 670, No. 1, 04.12.2008, p. 18-21.

Research output: Contribution to journalArticle

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