Resonant Dark Forces and Small Scale Structure

Abstract

A dark force can impact the cosmological history of dark matter (DM), both explaining observed cores in dwarf galaxies and setting the DM relic density through annihilation to dark force bosons. For GeV - TeV DM mass, DM self-scattering in dwarf galaxy halos exhibits quantum mechanical resonances, analogous to a Sommerfeld enhancement for annihilation. We show that a simple model of DM with a dark force can accommodate all astrophysical bounds on self-interactions in halos and explain the observed relic density, through a single coupling constant.

5 pages, 3 figures

References in corpus (5)

• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• Constraints on the Self-Interaction Cross-Section of Dark Matter from Numerical Simulations of the Merging Galaxy Cluster 1E 0657-5
• Cores in Dwarf Galaxies from Dark Matter with a Yukawa Potential
• Does the Fornax dwarf spheroidal have a central cusp or core?
• Is dark matter with long-range interactions a solution to all small-scale problems of ΛCDM cosmology?

Cited by in corpus (3)

• The non-gravitational interactions of dark matter in colliding galaxy clusters
• Testing Dark Matter Clustering with Redshift Space Distortions
• Reducing cosmological small scale structure via a large dark matter-neutrino interaction: constraints and consequences