Self-interacting hidden sector dark matter, small scale galaxy structure anomalies, and a dark force
Amin Aboubrahim, Wan-Zhe Feng, Pran Nath, Zhu-Yao Wang
Abstract
The short distance behavior of dark matter (DM) at galaxy scales exhibits several features not explained by the typical cold dark matter with velocity-independent cross section. We discuss a particle physics model with a hidden sector interacting feebly with the visible sector where a dark fermion self-interacts via a dark force with a light dark photon as the mediator. We study coupled Boltzmann equations involving two temperatures, one for each sector. We fit the velocity-dependent DM cross section to the data from scales of dwarf galaxies to clusters consistent with relic density constraint.
Topics & Concepts
PhysicsDark matterAstrophysicsHot dark matterCold dark matterDwarf galaxyDark fluidDark photonWarm dark matterGalaxyHidden sectorScalar field dark matterLight dark matterDark matter haloDark galaxyMixed dark matterCosmologyDark energyInteracting galaxyHaloCosmology and Gravitation TheoriesDark Matter and Cosmic PhenomenaGalaxies: Formation, Evolution, Phenomena