Chiral gravitational effect in time-dependent backgrounds

Kohei Kamada, Jun’ya Kume*, Yusuke Yamada

*この研究の対応する著者

研究成果: Article査読

2 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号292
ジャーナルJournal of High Energy Physics
2021
5
DOI
出版ステータスPublished - 2021 5月
外部発表はい

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学

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