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

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] ;  [3] ;  [4]
  1. Department of Physics, Tohoku University,Sendai, Miyagi 980-8578 (Japan)
  2. (WPI), TODIAS, The University of Tokyo,Kashiwa, Chiba 277-8583 (Japan)
  3. Kavli IPMU (WPI), TODIAS, The University of Tokyo,Kashiwa, Chiba 277-8583 (Japan)
  4. (Japan)
Publication Date:
OSTI Identifier:
22458389
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 10; Other Information: PUBLISHER-ID: JCAP10(2015)010; OAI: oai:repo.scoap3.org:12144; 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)
Sponsoring Org:
SCOAP3, CERN, Geneva (Switzerland)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AXIONS; BARYONS; GAUGE INVARIANCE; GRAVITATION; QUANTUM CHROMODYNAMICS; STRONG INTERACTIONS; SU-3 GROUPS; SUPERSYMMETRY; SYMMETRY BREAKING; UNIVERSE