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

Abstract

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 $\mathcal{O}(10-100)\mathrm{GeV}$.

14 pages, 4 figures

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Cited by in corpus (4)

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• Implications of an axino LSP for naturalness
• Discrete symmetries and mixing of Dirac neutrinos
• From Peccei Quinn symmetry to mass hierarchy problem