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Title: Strongly broken Peccei-Quinn symmetry in the early Universe

Abstract

We consider QCD axion models where the Peccei-Quinn symmetry is badly broken by a larger amount in the past than in the present, in order to avoid the axion isocurvature problem. Specifically we study supersymmetric axion models where the Peccei-Quinn symmetry is dynamically broken by either hidden gauge interactions or the SU(3){sub c} strong interactions whose dynamical scales are temporarily enhanced by the dynamics of flat directions. The former scenario predicts a large amount of self-interacting dark radiation as the hidden gauge symmetry is weakly coupled in the present Universe. We also show that the observed amount of baryon asymmetry can be generated by the QCD axion dynamics via spontaneous baryogenesis. We briefly comment on the case in which the PQ symmetry is broken by a non-minimal coupling to gravity.

Authors:
 [1];  [2]
  1. Department of Physics, Tohoku University, Sendai, Miyagi 980-8578 (Japan)
  2. Kavli IPMU (WPI), TODIAS, The University of Tokyo, Kashiwa, Chiba 277-8583 (Japan)
Publication Date:
OSTI Identifier:
22525291
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2015; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASYMMETRY; AXIONS; BARYONS; COUPLING; GAUGE INVARIANCE; GRAVITATION; QUANTUM CHROMODYNAMICS; STRONG INTERACTIONS; SU-3 GROUPS; SUPERSYMMETRY; SYMMETRY BREAKING; UNIVERSE

Citation Formats

Takahashi, Fuminobu, and Yamada, Masaki, E-mail: fumi@tuhep.phys.tohoku.ac.jp, E-mail: yamadam@icrr.u-tokyo.ac.jp. Strongly broken Peccei-Quinn symmetry in the early Universe. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/10/010.
Takahashi, Fuminobu, & Yamada, Masaki, E-mail: fumi@tuhep.phys.tohoku.ac.jp, E-mail: yamadam@icrr.u-tokyo.ac.jp. Strongly broken Peccei-Quinn symmetry in the early Universe. United States. doi:10.1088/1475-7516/2015/10/010.
Takahashi, Fuminobu, and Yamada, Masaki, E-mail: fumi@tuhep.phys.tohoku.ac.jp, E-mail: yamadam@icrr.u-tokyo.ac.jp. Thu . "Strongly broken Peccei-Quinn symmetry in the early Universe". United States. doi:10.1088/1475-7516/2015/10/010.
@article{osti_22525291,
title = {Strongly broken Peccei-Quinn symmetry in the early Universe},
author = {Takahashi, Fuminobu and Yamada, Masaki, E-mail: fumi@tuhep.phys.tohoku.ac.jp, E-mail: yamadam@icrr.u-tokyo.ac.jp},
abstractNote = {We consider QCD axion models where the Peccei-Quinn symmetry is badly broken by a larger amount in the past than in the present, in order to avoid the axion isocurvature problem. Specifically we study supersymmetric axion models where the Peccei-Quinn symmetry is dynamically broken by either hidden gauge interactions or the SU(3){sub c} strong interactions whose dynamical scales are temporarily enhanced by the dynamics of flat directions. The former scenario predicts a large amount of self-interacting dark radiation as the hidden gauge symmetry is weakly coupled in the present Universe. We also show that the observed amount of baryon asymmetry can be generated by the QCD axion dynamics via spontaneous baryogenesis. We briefly comment on the case in which the PQ symmetry is broken by a non-minimal coupling to gravity.},
doi = {10.1088/1475-7516/2015/10/010},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 10,
volume = 2015,
place = {United States},
year = {2015},
month = {10}
}