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arXiv · 2006.10479

Reacceleration of charged dark matter

M. Kachelriess·J. Tjemsland
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Abstract

Charged particles scattering on moving inhomogenities of the magnetised interstellar medium can gain energy through the process of second-order Fermi acceleration. This energy gain depletes in turn the magnetic wave spectrum around the resonance wave-vector $k\sim 1/R_L$, where $R_L$ is the Larmor radius of the charged particle. This energy transfer can prohibit the cascading of magnetic turbulence to smaller scales, leading to a drop in the diffusion coefficient and allowing the efficient exchange of charged dark matter particles in the disk and the halo. As a result, terrestial limits from direct detection experiments apply to charged dark matter. Together with the no-observation of a drop in the diffusion coefficient, this excludes charged dark matter for $10^3 GeV\lesssim m/q \lesssim 10^{11} GeV$, even if the charged dark matter abundance is only a small part of the total relic abundance.

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M. Kachelriess, J. Tjemsland. 2020-06-18. Reacceleration of charged dark matter. https://doi.org/10.1088/1475-7516%2F2020%2F10%2F001

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