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arXiv 1509.07557hep-thgr-qc
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有限温度下的感生费米子电流

Induced fermionic current at finite temperature

Eugênio R. Bezerra de Mello, Aram A. Saharian, Azadeh Mohammadi

摘要:

在这里,我们分析了有限的温度期望值的电荷和电流密度的大质量费米子量子场与非零化学势,$μ$,引起的磁通量沿轴的理想宇宙弦。这些密度被分解成真空期望值和来自粒子和反粒子的贡献。具体地,电荷密度是周期等于量子通量的磁通量的偶周期函数和化学势的奇函数。电流密度的唯一非零分量对应于方位电流,并且它是磁通量的奇周期函数和化学势的偶函数。这两种分析都是针对$|μ|$小于场量子$m$的质量的情况开发的。

英文摘要:

Here we analyze the finite temperature expectation values of the charge and current densities for a massive fermionic quantum field with nonzero chemical potential, $μ$, induced by a magnetic flux running along the axis of an idealized cosmic string. These densities are decomposed into the vacuum expectation values and contributions coming from the particles and antiparticles. Specifically the charge density is an even periodic function of the magnetic flux with the period equal to the quantum flux and an odd function of the chemical potential. The only nonzero component of the current density corresponds to the azimuthal current and it is an odd periodic function of the magnetic flux and an even function of the chemical potential. Both analyzed are developed for the cases where $|μ|$ is smaller than the mass of the field quanta, $m$.

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