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arXiv 2212.04414gr-qchep-thmath-phmath.MP
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弯曲时空上Dirac场的半经典分析

Semiclassical analysis of Dirac fields on curved spacetime

Marius A. Oancea, Achal Kumar

摘要:

本文给出了在任意时空背景和固定电磁场存在下狄拉克场的半经典分析。我们的方法是基于一个Wentzel-Kramers-Brillouin近似,并在小的扩展参数$\hbar$的领先和次领先的顺序的结果进行了分析。考虑到波包内外自由度之间的自旋-轨道耦合,导出了含自旋相关项的有效射线方程。这些方程描述了定域狄拉克波包的引力自旋霍尔效应。我们对待大质量和无质量狄拉克场,并显示如何协变定义的Berry连接和相关的Berry曲率管理的半经典动力学。引力自旋霍尔方程是自旋天体的Mathisson-Papapetrou方程的特例。

英文摘要:

We present a semiclassical analysis for Dirac fields on an arbitrary spacetime background and in the presence of a fixed electromagnetic field. Our approach is based on a Wentzel-Kramers-Brillouin approximation, and the results are analyzed at leading and next-to-leading order in the small expansion parameter $\hbar$. Taking into account the spin-orbit coupling between the internal and external degrees of freedom of wave packets, we derive effective ray equations with spin-dependent terms. These equations describe the gravitational spin Hall effect of localized Dirac wave packets. We treat both massive and massless Dirac fields and show how a covariantly defined Berry connection and the associated Berry curvature govern the semiclassical dynamics. The gravitational spin Hall equations are shown to be particular cases of the Mathisson-Papapetrou equations for spinning objects.

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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