Dark Matter in the minimal Inverse Seesaw mechanism

Abstract

We consider the possibility of simultaneously addressing the dark matter problem and neutrino mass generation in the minimal inverse seesaw realisation. The Standard Model is extended by two right-handed neutrinos and three sterile fermionic states, leading to three light active neutrino mass eigenstates, two pairs of (heavy) pseudo-Dirac mass eigenstates and one (mostly) sterile state with mass around the keV, possibly providing a dark matter candidate, and accounting for the recently observed and still unidentified monochromatic 3.5 keV line in galaxy cluster spectra. The conventional production mechanism through oscillation from active neutrinos can account only for $\sim 43\%$ of the observed relic density. This can be slightly increased to $\sim 48\%$ when including effects of entropy injection from the decay of light (with mass below 20 GeV) pseudo-Dirac neutrinos. The correct relic density can be achieved through freeze-in from the decay of heavy (above the Higgs mass) pseudo-Dirac neutrinos. This production is only effective for a limited range of masses, such that the decay occurs not too far from the electroweak phase transition. We thus propose a simple extension of the inverse seesaw framework, with an extra scalar singlet coupling to both the Higgs and the sterile neutrinos, which allows to achieve the correct dark matter abundance in a broader region of the parameter space, in particular in the low mass region for the pseudo-Dirac neutrinos.

36 pages, 17 figures. V2 matches the version accepted for publication on JCAP

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Cited by in corpus (18)

• The Dawn of FIMP Dark Matter: A Review of Models and Constraints
• The Present and Future Status of Heavy Neutral Leptons
• Discovery of a 3.5 keV line in the Galactic Center and a Critical Look at the Origin of the Line Across Astronomical Targets
• keV Sterile Neutrino Dark Matter from Singlet Scalar Decays: Basic Concepts and Subtle Features
• Indirect searches for sterile neutrinos at a high-luminosity Z-factory
• keV Sterile Neutrino Dark Matter from Singlet Scalar Decays: The Most General Case
• Hot New Early Dark Energy
• Lepton flavor violating decays of vector quarkonia and of the $Z$ boson
• Dark Matter and the elusive ${\mathbf{Z}}^{\prime }$ in a dynamical Inverse Seesaw scenario
• Inverse Seesaw Model with a Modular $S_4^{}$ Symmetry: Lepton Flavor Mixing and Warm Dark Matter
• ALP-portal majorana dark matter
• Naturalness and lepton number/flavor violation in inverse seesaw models
• Time-delayed neutrino emission from supernovae as a probe of dark matter-neutrino interactions
• Roles of sterile neutrinos in particle physics and cosmology
• Neutrino masses and mixing in Minimal Inverse Seesaw using $A_4$ modular symmetry
• Twin Sterile Neutrino Dark Matter
• Flavor symmetric origin of texture zeros in minimal inverse seesaw and impacts on leptogenesis
• Connecting dark matter, baryogenesis and neutrinoless double beta decay in a $A_4\otimes Z_8$ based $\nu$2HDM