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arXiv 1708.00515hep-phnucl-th
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强磁场中夸克-胶子等离子体的体粘滞系数

Bulk Viscosity of Quark-Gluon Plasma in Strong Magnetic Fields

Koichi Hattori, Xu-Guang Huang, Dirk H. Rischke, Daisuke Satow

摘要:

在LLL近似下研究了强磁场中夸克-胶子等离子体的粘性。我们首先表明,在平行于磁场的方向上的体积粘度是唯一的组成部分,有一个从夸克占据的LLL的贡献。然后,我们从久保公式计算的体粘滞度,并发现一个有趣的夸克质量依赖性之间的竞争共形对称性的抑制体粘滞度和增强的平均自由路径的手征守恒,这支配的行为在无质量的限制。夸克对沿磁场的粘性的贡献变得比没有磁场时的贡献大。考虑胶子的贡献,我们还对其他输运系数作了简要的估计。我们表明,剪切粘度被抑制相比,它们的值在没有一个磁场。

英文摘要:

We investigate the viscosities of the quark-gluon plasma in strong magnetic fields within the leading-log and lowest Landau level (LLL) approximations. We first show that the bulk viscosity in the direction parallel to the magnetic field is the only component that has a contribution from the quarks occupying the LLL. We then compute the bulk viscosity from the Kubo formula and find an intriguing quark-mass dependence as a consequence of a competition between the suppression of the bulk viscosity by conformal symmetry and an enhancement of the mean-free path by chirality conservation, which governs the behavior in the massless limit. The quark contribution to the viscosity along the magnetic field becomes larger than the one in the absence of a magnetic field. We also briefly estimate the other transport coefficients by considering the contribution of gluons. We show that the shear viscosities are suppressed compared to their values in the absence of a magnetic field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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