Axion domain wall baryogenesis

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11 Citations (Scopus)

Abstract

We propose a new scenario of baryogenesis, in which annihilation of axion domain walls generates a sizable baryon asymmetry. Successful baryogenesis is possible for a wide range of the axion mass and decay constant, m 108-1013 GeV and f 1013-1016 GeV . Baryonic isocurvature perturbations are significantly suppressed in our model, in contrast to various spontaneous baryogenesis scenarios in the slow-roll regime. In particular, the axion domain wall baryogenesis is consistent with high-scale inflation which generates a large tensor-to-scalar ratio within the reach of future CMB B-mode experiments. We also discuss the gravitational waves produced by the domain wall annihilation and its implications for the future gravitational wave experiments.

Original languageEnglish
Article number046
JournalJournal of Cosmology and Astroparticle Physics
Volume2015
Issue number7
DOIs
Publication statusPublished - 2015 Jul 1

Keywords

  • Cosmic strings
  • axions
  • baryon asymmetry
  • domain walls
  • monopoles
  • physics of the early universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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