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arXiv 2104.00583hep-phastro-ph.COgr-qchep-th
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含时背景中的手征引力效应

Chiral gravitational effect in time-dependent backgrounds

Kohei Kamada, Jun'ya Kume, Yusuke Yamada

摘要:

手征磁效应的引力对应物,被称为手征引力效应,也可以在宇宙学设置中感兴趣。在这项研究中,我们研究了这种效应在含时手征非对称费米子背景和在膨胀的时空制定的有效作用的引力波。我们还分析了反常方程,以了解引力波对热手征等离子体的反作用是如何发生的。我们发现手征化学势的非平凡时间依赖性是手征引力效应的关键因素,手征化学势的非平凡时间依赖性可以在重子生成的某些情况下被诱导出来。事实证明,效应的“记忆”印刻在等离子体中传播的高频引力波上。简要讨论了宇宙学意义和对引力波观测的潜在影响。

英文摘要:

Gravitational counterpart of the chiral magnetic effect, which is referred as the chiral gravitational effect, can also be of interest in a cosmological setup. In this study, we investigate this effect in the time-dependent chiral asymmetric fermion background and in the expanding spacetime by formulating the effective action of gravitational waves. We also analyze the anomaly equation to see how the backreaction from gravitational waves to thermal chiral plasma occurs. We find that the non-trivial time dependence of chiral chemical potential, which can be induced in some scenarios of baryogenesis, is the key ingredient of the chiral gravitational effect. It turns out that the "memory" of the effect is imprinted on the high frequency gravitational waves propagating in the plasma. Cosmological implications and potential effects on the gravitational wave observation are briefly discussed.

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