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arXiv · 1402.6523

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

Wan-Il Park
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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 $\mathcal{O}(10-100) {\rm GeV}$.

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Wan-Il Park. 2014-02-26. PQ-symmetry for a small Dirac neutrino mass, dark radiation and cosmic neutrinos. https://doi.org/10.1088/1475-7516%2F2014%2F06%2F049

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