Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 10, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2015/10/010
Keywords
axions; particle physics - cosmology connection; baryon asymmetry; supersymmetry and cosmology
Funding
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- Program for the Leading Graduate Schools, MEXT, Japan
- JSPS [24740135, 25.8715]
- [23104008]
- [26247042]
- [26287039]
- Grants-in-Aid for Scientific Research [26247042, 13J08715] Funding Source: KAKEN
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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)(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.
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