Dwarf Galaxy Sized Monopoles as Dark Matter?

Abstract

We propose a model of dark matter: galaxy-sized 't Hooft-Polyakov magnetic monopoles in a new, extraordinarily weakly coupled SU(2) gauge sector with an adjoint Higgs field and two flavors of fundamental fermions. We fit the parameters by asserting that the dark matter halos of the lightest dwarf spheroidal (dSph) galaxies consist of a single charge Q=1 monopole. Lensing and wide binary bounds are then easily satisfied and the monopoles form in time to help with CMB fluctuations. In this model dSph and low surface brightness (LSB) halos automatically have (1) A minimum mass - Dirac quantization solves the missing satellite problem, (2) A constant density core (r<r_1), (3) An intermediate regime (r_1<r<r_2) with density proportional to 1/r^2. The model predicts that (A) r_1 is proportional to the stellar rotational/dispersion velocities at r_1<r<r_2, (B) r_2 is reasonably Q independent and so dSph halos extend at least ten times farther than their half-light and tidal radii, (C) The minimal stellar dispersion is 1/sqrt{2} times the next-smallest allowed value. A serious potential problem with our proposal is that non-BPS monopoles are repulsive. The Jackiw-Rebbi mechanism yields four species of monopoles, and we assume that, for some choice of Yukawa couplings, one species is light and serves only to screen the repulsive interactions of another.

30 pages, 1 eps figure, refs added

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