Abstract
We reexamine the limits on charged dark matter particles.We show that if their mass and charge fall in the range100(qX/e)2 ≲ mX ≲ 108(qX/e) TeV, then magnetic fieldsprevent particles in the halo from entering the galactic disk, whilethose initially trapped inside are accelerated through the Fermimechanism and ejected within about 0.1-1 Gyrs. Consequently,previous constraints on charged dark matter based on terrestrialnon-observation are invalid within that range. Further, we find thatcharged massive particles may simultaneously solve severallong-standing astrophysical problems, including the underabundanceof dwarf galaxies, the shallow density profiles in the cores of thedwarf galaxies, the absence of cooling flows in the cores of galaxyclusters, and several others.
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