PQ-symmetry for a small Dirac neutrino mass, dark radiation and cosmic neutrinos

Journal Article · Sun Jun 01 00:00:00 EDT 2014 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2014/06/049· OSTI ID:22373497

Park, Wan-Il ^[1]

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1. School of Physics, KIAS, Seoul 130-722 (Korea, Republic of)

We propose a supersymmetric scenario in which the small Yukawa couplings for the Dirac neutrino mass term are generated by the spontaneous-breaking of Pecci-Quinn symmetry. In this scenario, a right amount of dark matter relic density can be obtained by either right-handed sneutrino or axino LSP, and a sizable amount of axion dark radiation can be obtained. Interestingly, the decay of right-handed sneutrino NLSP to axino LSP is delayed to around the present epoch, and can leave an observable cosmological background of neutrinos at the energy scale of O(10−100) GeV.

• OSTI ID: 22373497
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2014, Issue 06; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COSMIC NEUTRINOS
DENSITY
GEV RANGE 100-1000
MASS
NONLUMINOUS MATTER
PARTICLE DECAY
SUPERSYMMETRY