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arXiv · 1405.6967

7 keV Sterile neutrino dark matter in $U(1)_R-$ lepton number model

Sabyasachi Chakraborty·Dilip Kumar Ghosh·Sourov Roy
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Abstract

We study the phenomenology of a keV sterile neutrino in a supersymmetric model with $U(1)_R-$ lepton number in the light of a very recent observation of an X-ray line signal at around 3.5 keV, detected in the X-ray spectra of Andromeda galaxy and various galaxy clusters including the Perseus galaxy cluster. This model not only provides a small tree level mass to one of the active neutrinos but also renders a suitable warm dark matter candidate in the form of a sterile neutrino with negligible active-sterile mixing. Light neutrino masses and mixing can be explained once one-loop radiative corrections are taken into account. The scalar sector of this model can accommodate a Higgs boson with a mass of $\sim$ 125 GeV. In this model gravitino is the lightest supersymmetric particle (LSP) and we also study the cosmological implications of this light gravitino with mass $\sim \mathcal O$(GeV).

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Sabyasachi Chakraborty, Dilip Kumar Ghosh, Sourov Roy. 2014-10-27. 7 keV Sterile neutrino dark matter in $U(1)_R-$ lepton number model. https://doi.org/10.1007/jhep10(2014)146

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