Mirror Dark Matter and Core Density of Galaxies

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  • 20 January 2000
Abstract
Spergel and Steinhardt recently suggested that collisional, but dissipationless, dark matter would resolve the core density problem in such dark matter-dominated galaxies as the dwarf galaxies. We present a particle physics realization of that suggestion: the asymmetric mirror universe model introduced to explain the neutrino puzzles and the microlensing anomaly supplemented by a new U(1) force. The mirror baryons are the dark matter particles with the desired properties. The time scales are right for resolution of the core density problem and formation of mirror stars (MACHOs observed in microlensing experiments). The mass of the region homogenized by Silk damping is roughly that of galaxies.

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