Renormalization in gravitational leptogenesis with pseudo-scalar-tensor coupling

Kohei Kamada, Jun'ya Kume, Yusuke Yamada

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number030
JournalJournal of Cosmology and Astroparticle Physics
Volume2020
Issue number10
DOIs
Publication statusPublished - 2020 Oct
Externally publishedYes

Keywords

  • ination
  • leptogenesis
  • primordial gravitational waves (theory)

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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