Self-interacting Dark Matter with Scalar Dilepton Mediator

Abstract

The cold dark matter (CDM) candidate with weakly interacting massive particles can successfully explain the observed dark matter relic density in cosmic scale and the large-scale structure of the Universe. However, a number of observations at the satellite galaxy scale seem to be inconsistent with CDM simulation. This is known as the small-scale problem of CDM. In recent years, it has been demonstrated that self-interacting dark matter (SIDM) with a light mediator offers a reasonable explanation for the small-scale problem. We adopt a simple model with SIDM and focus on the effects of Sommerfeld enhancement. In this model, the dark matter candidate is a leptonic scalar particle with a light mediator. We have found several regions of the parameter space with proper masses and coupling strength generating a relic density that is consistent with the observed CDM relic density. Furthermore, this model satisfies the constraints of recent direct searches and indirect detection for dark matter as well as the effective number of neutrinos and the observed small-scale structure of the Universe. In addition, this model with the favored parameters can resolve the discrepancies between astrophysical observations and $N$-body simulations.

REVTEX, 32 pages, 11 figures. To be published in Phys. Rev. D

References in corpus (18)

• A direct empirical proof of the existence of dark matter
• Observation of an anomalous positron abundance in the cosmic radiation
• A Theory of Dark Matter
• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
• Searching for Dark Matter Annihilation in Recently Discovered Milky Way Satellites with Fermi-LAT
• Non-perturbative Effect on Thermal Relic Abundance of Dark Matter
• Primordial Nucleosynthesis: from precision cosmology to fundamental physics
• Search for dark matter annihilations towards the inner Galactic halo from 10 years of observations with H.E.S.S
• Neutrino Backgrounds to Dark Matter Searches
• Pathways to Naturally Small Dirac Neutrino Masses
• Two-loop Dirac neutrino mass and WIMP dark matter
• Nuclear structure aspects of spin-independent WIMP scattering off xenon
• Galactic Center Excess in Gamma Rays from Annihilation of Self-Interacting Dark Matter
• Radiative Left-Right Dirac Neutrino Mass
• Very Degenerate Higgsino Dark Matter
• Latest results on dark matter searches with H.E.S.S
• Confronting Dirac Fermionic Dark Matter with Recent Data