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Title: Axion domain wall baryogenesis

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≃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.

Authors:
;  [1];  [1];  [2]
  1. Department of Physics, Tohoku University,Sendai 980-8578 (Japan)
  2. (Japan)
Publication Date:
Sponsoring Org.:
SCOAP3, CERN, Geneva (Switzerland)
OSTI Identifier:
22458355
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 07; Other Information: PUBLISHER-ID: JCAP07(2015)046; OAI: oai:repo.scoap3.org:11256; Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANNIHILATION; ASYMMETRY; AXIONS; BARYONS; DECAY; DISTURBANCES; GEV RANGE; GRAVITATIONAL WAVES; PERTURBATION THEORY

Citation Formats

Daido, Ryuji, Kitajima, Naoya, Takahashi, Fuminobu, and Kavli IPMU, TODIAS, University of Tokyo,Kashiwa 277-8583. Axion domain wall baryogenesis. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/07/046.
Daido, Ryuji, Kitajima, Naoya, Takahashi, Fuminobu, & Kavli IPMU, TODIAS, University of Tokyo,Kashiwa 277-8583. Axion domain wall baryogenesis. United States. doi:10.1088/1475-7516/2015/07/046.
Daido, Ryuji, Kitajima, Naoya, Takahashi, Fuminobu, and Kavli IPMU, TODIAS, University of Tokyo,Kashiwa 277-8583. 2015. "Axion domain wall baryogenesis". United States. doi:10.1088/1475-7516/2015/07/046.
@article{osti_22458355,
title = {Axion domain wall baryogenesis},
author = {Daido, Ryuji and Kitajima, Naoya and Takahashi, Fuminobu and Kavli IPMU, TODIAS, University of Tokyo,Kashiwa 277-8583},
abstractNote = {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.},
doi = {10.1088/1475-7516/2015/07/046},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 07,
volume = 2015,
place = {United States},
year = 2015,
month = 7
}
  • 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 domainmore » wall annihilation and its implications for the future gravitational wave experiments.« less
  • We examine the collapse of an axionic domain wall bounded by an axionic string. It is found that the collapse proceeds quickly and axionic domain walls disappear. However axions are emitted in the collapse and its energy density increases during the radiation-dominated era and contributes significantly to the present mass density of the Universe. In particular the axion emitted from the wall can account for the dark matter in the Universe for [ital F][sub [ital a]][approx gt]10[sup 10] GeV.
  • We show that axion domain walls gain spontaneous magnetization in early Universe by trapping either electrons or positrons with their spins polarized. The reason is that the walls produce an attractive potential for these particles. We argue that the wall bounded by an axionic superconducting string leaves a magnetic field after its decay. We obtain a field {approximately}10{sup {minus}23} G on the scale of horizon at the recombination. {copyright} {ital 1997} {ital The American Physical Society}
  • A new type of invisible-axion model based on the recent variant axion models is presented. It belongs to the N = 1 type model and hence is free of domain-wall problems. The Peccei-Quinn-symmetry transformations are not totally generation and flavor blind which may help in understanding the small values of electron and u-quark and large t-quark masses. The light neutrino mass pattern in the two-Higgs-singlet models can have a very different hierarchy which differs from the other type of invisible-axion models.