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首页> 外文期刊>Physical review, D >Finite temperature bosonic charge and current densities in compactified cosmic string spacetime
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Finite temperature bosonic charge and current densities in compactified cosmic string spacetime

机译:有限温度旋转电荷和压实宇宙弦弦串的电流密度

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摘要

In this paper, we study the expectation values of the induced charge and current densities for a massive bosonic field with nonzero chemical potential in the geometry of a higher-dimensional compactified cosmic string with magnetic fluxes along the string core and also enclosed by the compactified direction in thermal equilibrium at finite temperature T. These densities are calculated by decomposing them into the vacuum expectation values and finite temperature contributions coming from the particles and antiparticles. The only nonzero components correspond to the charge, azimuthal, and axial current densities. By using the Abel-Plana formula, we decompose the components of the densities into the part induced by the cosmic string and the one by the compactification. The charge density is an odd function of the chemical potential and even periodic function of the magnetic flux with a period equal to the quantum flux. Moreover, the azimuthal (axial) current density is an even function of the chemical potential and an odd (even) periodic function of the magnetic flux with the same period. In this paper, our main concern is the thermal effect on the charge and current densities, including some limiting cases, the low-and high-temperature approximations. We show that in all cases, the temperature enhances the induced densities.
机译:在本文中,我们研究了在沿着弦芯的高度压实宇宙串的几何形状中具有非零化学电位的诱导电荷和电流密度的预期值,其具有沿着弦芯的磁通量,并被压实方向包围在有限温度下的热平衡中。通过将它们分解成真空预期值和来自粒子和抗颗粒的有限温度贡献来计算这些密度。唯一的非零组件对应于电荷,方位角和轴向电流密度。通过使用abel-plana公式,我们将密度的组分分解为由宇宙字符串诱导的部分和通过压缩的部分。电荷密度是化学电位的奇数函数,甚至是磁通量的周期性函数,其周期等于量子通量。此外,方位角(轴向)电流密度是化学电位的均匀函数和具有同一时段的磁通量的奇数(偶数)周期性函数。在本文中,我们主要关注的是对电荷和电流密度的热效应,包括一些限制案例,低温近似。我们表明,在所有情况下,温度都增强了诱导的密度。

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