Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-11-12
Phys.Rev.D83:063509,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, 2 figures; v2 - figures fixed, references added
Scientific paper
10.1103/PhysRevD.83.063509
We consider current observational constraints on the electromagnetic charge of dark matter. The velocity dependence of the scattering cross-section through the photon gives rise to qualitatively different constraints than standard dark matter scattering through massive force carriers. In particular, recombination epoch observations of dark matter density perturbations require that $\epsilon$, the ratio of the dark matter to electronic charge, is less than $10^{-6}$ for $m_X = 1 GeV$, rising to $\epsilon < 10^{-4}$ for $m_X = 10 TeV$. Though naively one would expect that dark matter carrying a charge well below this constraint could still give rise to large scattering in current direct detection experiments, we show that charged dark matter particles that could be detected with upcoming experiments are expected to be evacuated from the Galactic disk by the Galactic magnetic fields and supernova shock waves, and hence will not give rise to a signal. Thus dark matter with a small charge is likely not a source of a signal in current or upcoming dark matter direct detection experiments.
McDermott Samuel D.
Yu Hai-Bo
Zurek Kathryn M.
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