Signatures of Compact Halos of Sterile-Neutrino Dark Matter

Abstract

We investigate compact halos of sterile-neutrino dark matter and examine observable signatures with respect to neutrino and photon emission. Primarily, we consider two cases: primordial black-hole halos and ultra-compact mini-halos. In both cases, we find that there exists a broad range of possible parameter choices such that detection in the near future with X-ray and gamma-ray telescopes might be well possible. In fact, for energies above $10\mathrm{TeV}$, the neutrino telescope IceCube would be a splendid detection machine for such macroscopic dark-matter candidates.

arXiv comment6 pages, 2 figures, 2 tables; v2: minor modifications to match published version

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• Primordial Black Holes as Dark Matter: Recent Developments
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• Hawking Radiation Signatures from Primordial Black Holes Transiting the Inner Solar System: Prospects for Detection
• Decaying Dark Matter in Halos of Primordial Black Holes