Axion domain wall baryogenesis

Journal Article · Wed Jul 01 04:00:00 EDT 2015 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2015/07/046· OSTI ID:22525652

Daido, Ryuji; Kitajima, Naoya; Takahashi, Fuminobu ^[1]

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1. Department of Physics, Tohoku University, Sendai 980-8578 (Japan)

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 ≅ 10{sup 8}–10{sup 13} GeV and f ≅ 10{sup 13}–10{sup 16} 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.

• OSTI ID: 22525652
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 07 Vol. 2015; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ANNIHILATION
ASYMMETRY
AXIONS
BARYONS
COSMOLOGICAL INFLATION
DISTURBANCES
GRAVITATIONAL WAVES
INFLATIONARY UNIVERSE
MASS
PARTICLE DECAY
SCALARS
TENSORS