Negative off-diagonal conductivities in a weakly coupled quark-gluon plasma at the leading-log order

被引：17

作者：

Chen, Jiunn-Wei ^{[1
,2
]}

Liu, Yen-Fu ^{[1
,2
]}

Pu, Shi ^{[1
,2
,3
,4
]}

Song, Yu-Kun ^{[3
,4
,5
]}

Wang, Qun ^{[3
,4
]}

机构：

[1] Natl Taiwan Univ, Natl Ctr Theoret Sci, Dept Phys, Taipei 10617, Taiwan

[2] Natl Taiwan Univ, Leung Ctr Cosmol & Particle Astrophys, Taipei 10617, Taiwan

[3] Univ Sci & Technol China, Interdisciplinary Ctr Theoret Study, Hefei 230026, Anhui, Peoples R China

[4] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China

[5] Cent China Normal Univ, Minist Educ, Key Lab Quark & Lepton Phys, Wuhan, Peoples R China

来源：

PHYSICAL REVIEW D | 2013年 / 88卷 / 08期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

BULK VISCOSITY; PERSPECTIVE; QCD;

D O I：

10.1103/PhysRevD.88.085039

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We calculate the conductivity matrix of a weakly coupled quark-gluon plasma at the leading-log order. By setting all quark chemical potentials to be identical, the diagonal conductivities become degenerate and positive, while the off-diagonal ones become degenerate but negative (or zero when the chemical potential vanishes). This means a potential gradient of a certain fermion flavor can drive backward currents of other flavors. A simple explanation is provided for this seemingly counterintuitive phenomenon. It is speculated that this phenomenon is generic even beyond the leading-log order, and it is most easily measured in cold atom experiments.

引用

页数：10

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