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

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).

V2, minor modifications in the text, references added, published in JHEP

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Cited by in corpus (5)

• Nonthermal Two Component Dark Matter Model for Fermi-LAT $\gamma$-ray excess and 3.55 keV X-ray Line
• A Fresh Look at keV Sterile Neutrino Dark Matter from Frozen-In Scalars
• Non-abelian Dark Matter Solutions for Galactic Gamma-ray Excess and Perseus 3.5 keV X-ray Line
• Displaced Vertices from X-ray Lines
• Supersymmetric Higgs-portal and X-ray lines