keV Warm Dark Matter via the Supersymmetric Higgs Portal

Abstract

Warm dark matter (WDM) may resolve the possible conflict between observed galaxy halos and the halos produced in cold dark matter (CDM) simulations. Here we present an extension of MSSM to include WDM by adding a gauge singlet fermion, \barχ, with a portal-like coupling to the MSSM Higgs doublets. This model has the property that the dark matter is {\it necessarily warm}. In the case where M_{\barχ} is mainly due to electroweak symmetry breaking, the \barχ mass is completely determined by its relic density and the reheating temperature, T_R. For 10^2 GeV < T_{R} < 10^{5} GeV$, the range allowed by \bar{chi} production via thermal Higgs annihilation, the \barχ mass is in the range 0.3-4 keV, precisely the range required for WDM. The primordial phase-space density, Q, can directly account for that observed in dwarf spheroidal galaxies, Q \approx 5 x 10^{6}(eV/cm^3)/(km/s)^3,, when the reheating temperature is in the range T_R \approx 10-100 TeV, in which case M_{\barχ} \approx 0.45 keV. The free-streaming length is in the range 0.3-4 Mpc, which can be small enough to alleviate the problems of overproduction of galaxy substructure and low angular momentum of CDM simulations.

6 pages LaTeX, Significantly expanded discussion. To be published in Physical Review D

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Cited by in corpus (11)

• UltraViolet Freeze-in
• keV Neutrino Model Building
• Model independent analysis of dark matter points to a particle mass at the keV scale
• Warm Dark Matter from keVins
• Warm Dark Matter via Ultra-Violet Freeze-In: Reheating Temperature and Non-Thermal Distribution for Fermionic Higgs Portal Dark Matter
• 3.5 keV X-ray line and R-Parity Conserving Supersymmetry
• Matter Power Spectrum of Light Freeze-in Dark Matter: With or without Self-Interaction
• Stellar Profile Independent Determination of the Dark Matter Distribution of the Fornax Local Group Dwarf Spheroidal Galaxy
• FIMP Dark Matter in bulk viscous non-standard cosmologies
• Lepton parity dark matter and naturally unstable domain walls
• Cosmological Probes of Lepton Parity Freeze-in Dark Matter: $\Delta N_{\mathrm{eff}}$ & Gravitational Waves