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arXiv 1704.02808hep-thgr-qcnucl-th
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自由量子场的一般均衡二阶流体动力学系数

General equilibrium second-order hydrodynamic coefficients for free quantum fields

Universitá di Firenze(佛罗伦萨大学);INFN Sezione di Firenze(意大利国家核物理研究所佛罗伦萨分部);Institut für Theoretische Physik, Universität Heidelberg(海德堡大学理论物理研究所);New York University Florence(纽约大学佛罗伦萨分校)

M. Buzzegoli, E. Grossi, F. Becattini

AI总结:

本文研究自由玻色子和狄拉克场在热旋度下的二阶修正,通过相关子确定Kubo公式,揭示量子起源的修正效应。

摘要:

我们系统地计算了自由玻色子和狄拉克场的应力能张量和电流在热旋度下的二阶修正,这些修正是非耗散的,因为在一般热力学平衡下,守恒的洛伦兹群生成元的平均值不为零。其平衡性质使得可以通过角动量和提升算子与应力能张量和电流的相关子来表达相关系数,从而更简单地确定所谓的Kubo公式。我们显示,至少对于自由场,这些修正具有量子起源,并研究了几个极限情况,并将结果与之前的计算进行了比较。我们发现,自由狄拉克场的轴向电流在不考虑异常项的情况下,其修正与旋度成正比。

英文摘要:

We present a systematic calculation of the corrections of the stress-energy tensor and currents of the free boson and Dirac fields up to second order in thermal vorticity, which is relevant for relativistic hydrodynamics. These corrections are non-dissipative because they survive at general thermodynamic equilibrium with non vanishing mean values of the conserved generators of the Lorentz group, i.e. angular momenta and boosts. Their equilibrium nature makes it possible to express the relevant coefficients by means of correlators of the angular-momentum and boost operators with stress-energy tensor and current, thus making simpler to determine their so-called "Kubo formulae". We show that, at least for free fields, the corrections are of quantum origin and we study several limiting cases and compare our results with previous calculations. We find that the axial current of the free Dirac field receives corrections proportional to the vorticity independently of the anomalous term.

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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