Renormalization in gravitational leptogenesis with pseudo-scalar-tensor coupling

Kohei Kamada, Jun'ya Kume, Yusuke Yamada

研究成果: Article査読

7 被引用数 (Scopus)

抄録

We consider the renormalization in the pseudo-scalar inflation models with the gravitational Chern-Simons term. In this model, lepton asymmetry is generated from the chiral gravitational waves produced due to the Chern-Simons term through the gravitational chiral anomaly. However, it is known that the naive estimate of the expectation value of the gravitational Chern-Pontryagin density as well as the resultant lepton number density depend on the UV-cutoff scale, which raises a question on their validity. In this paper, we propose a way to renormalize the expectation value of the Chern-Pontryagin density to remove the UV-cutoff dependence. We also discuss the renormalized lepton number density when we adopt the minimal subtraction scheme and the viability of the gravitational leptogenesis scenario.

本文言語English
論文番号030
ジャーナルJournal of Cosmology and Astroparticle Physics
2020
10
DOI
出版ステータスPublished - 2020 10月
外部発表はい

ASJC Scopus subject areas

  • 天文学と天体物理学

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