Chiral vortical effect in Wigner function approach

Chiral vortical effect in Wigner function approach
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维格纳函数方法中的手性涡旋效应

DOI:
10.1103/physrevd.100.016008
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发表时间:
2018-10
期刊:
影响因子:
5
通讯作者:
Wang Qun
Wang Qun
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Gao Jian-Hua;Pang Jin-Yi;Wang Qun

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本文给出了背景电磁场中手性费米子的协变Wigner函数的一阶普朗克常数解的改进推导。我们使用静平衡条件下的热分布函数,包括$\beta^{\mu}=u^{\mu}/T$的压井条件,其中$u^{\mu}$和$T$分别为流体速度和温度。除了用热涡量代替了涡量外,结果与以前的结果一致。手性旋涡效应(CVE)电流由一阶解推导而来,与先前的显式洛伦兹协方差相同。在不假设热分布函数和静平衡条件的半经典展开中,可以自由选择一个定义了Wigner函数时间分量的参考系。所以显式洛伦兹协方差似乎丢失了。一旦使用静平衡条件下的热分布函数,CVE电流可以分解为法向和磁化两部分,每一部分都依赖于参考系。然而,可以证明两者的总和确实给出了与参考系无关的总CVE电流。
We give an improved derivation of the solutions to the covariant Wigner function for chiral fermions in background electromagnetic fields to the first order in the Planck constant. We use the thermal distribution function under static-equilibrium conditions including the Killing condition for $\beta^{\mu}=u^{\mu}/T$ with $u^{\mu}$ and $T$ being the fluid velocity and temperature respectively. The results reproduce our previous ones except that the vorticity is replaced by the thermal vorticity. The chiral vortical effect (CVE) current is derived from the first order solution in the same way as in previous works with explicit Lorentz covariance. In the semiclassical expansion without assuming the thermal distribution function and static-equilibrium conditions, there is a freedom to choose a reference frame in which the time-component of the Wigner function is defined. So the explicit Lorentz covariance seems to be lost. Once the thermal distribution function under static-equilibrium conditions is used, the CVE current can be decomposed into two parts, the normal and and magnetization part, each of which depends on the reference frame. However it can be shown that the sum of the two does give the total CVE current which is reference frame independent.
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