Shear viscosity of neutron-rich nucleonic matter near its liquid-gas phase transition

被引：17

作者：

Xu, Jun ^{[1
]}

Chen, Lie-Wen ^{[2
,3
,4
]}

Ko, Che Ming ^{[5
,6
]}

Li, Bao-An ^{[7
,8
]}

Ma, Yu Gang ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China

[2] Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200240, Peoples R China

[3] Shanghai Jiao Tong Univ, Shanghai Key Lab Particle Phys & Cosmol, Shanghai 200240, Peoples R China

[4] Natl Lab Heavy Ion Accelerator, Ctr Theoret Nucl Phys, Lanzhou 730000, Peoples R China

[5] Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA

[6] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA

[7] Texas A&M Univ, Dept Phys & Astron, Commerce, TX 75429 USA

[8] Xi An Jiao Tong Univ, Dept Appl Phys, Xian 710049, Peoples R China

来源：

PHYSICS LETTERS B | 2013年 / 727卷 / 1-3期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

ENTROPY DENSITY; NUCLEAR; ISOSPIN; MULTIFRAGMENTATION; RATIO; MODEL;

D O I：

10.1016/j.physletb.2013.10.051

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Within a relaxation time approach using free nucleon-nucleon cross sections modified by the in-medium nucleon masses that are determined from an isospin- and momentum-dependent effective nucleon-nucleon interaction, we investigate the specific shear viscosity (eta/s) of neutron-rich nucleonic matter near its liquid-gas phase transition. It is found that as the nucleonic matter is heated at fixed pressure or compressed at fixed temperature, its specific shear viscosity shows a valley shape in the temperature or density dependence, with the minimum located at the boundary of the phase transition. Moreover, the value of eta/s drops suddenly at the first-order liquid-gas phase transition temperature, reaching as low as 4-5 times the KSS bound of (h) over bar /4 pi. However, it varies smoothly for the second-order liquid-gas phase transition. Effects of the isospin degree of freedom and the nuclear symmetry energy on the value of eta/s are also discussed. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：244 / 248

页数：5

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