Signatures of Compact Halos of Sterile-Neutrino Dark Matter
  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
$10\,{\rm TeV}$, the neutrino telescope IceCube would be a splendid detection
machine for such macroscopic dark-matter candidates.
