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arXiv 2007.06632gr-qccond-mat.str-elhep-th
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挠率引起的引力$θ$项与引力电磁

Torsion-induced gravitational $θ$ term and gravitoelectromagnetism

Athanasios Chatzistavrakidis, Georgios Karagiannis, Peter Schupp

摘要:

受广义相对论的弱场展开和麦克斯韦电动力学定律之间的类比的启发,我们探讨了引力电磁学中宇称违反$θ$项的物理后果。这与常见的引力$θ$项形成为黎曼张量的平方不同。相反,它表现为拉格朗日量中重力电场和重力磁场的乘积,类似于麦克斯韦$θ$项。我们表明,这个部门可以产生于非线性引力的二次挠率项。类似于拓扑绝缘体的物理学,扭转诱导的$θ$参数可以导致在$θ$变化的区域的界面处的过量质量密度,并且因此其产生对牛顿引力定律的校正。我们还讨论了引力双子的Witten效应的一个类似物。

英文摘要:

Motivated by the analogy between a weak field expansion of general relativity and Maxwell's laws of electrodynamics, we explore physical consequences of a parity violating $θ$ term in gravitoelectromagnetism. This is distinct from the common gravitational $θ$ term formed as a square of the Riemann tensor. Instead it appears as a product of the gravitoelectric and gravitomagnetic fields in the Lagrangian, similar to the Maxwellian $θ$ term. We show that this sector can arise from a quadratic torsion term in nonlinear gravity. In analogy to the physics of topological insulators, the torsion-induced $θ$ parameter can lead to excess mass density at the interface of regions where $θ$ varies and consequently it generates a correction to Newton's law of gravity. We discuss also an analogue of the Witten effect for gravitational dyons.

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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