Ultracompact minihalos associated with stellar-mass primordial black
  holes
  The possibility that primordial black hole binary mergers of stellar mass can
explain the signals detected by the gravitational-wave interferometers has
attracted much attention. In this scenario, primordial black holes can comprise
only part of the entire dark matter, say, of order 0.1 %. This implies that
most of the dark matter is accounted for by a different component, such as
Weakly Interacting Massive Particles. We point out that in this situation, very
compact dark matter minihalos, composed of the dominant component of the dark
matter, are likely to be formed abundantly in the early Universe, with their
formation redshift and abundance depending on primordial non-Gaussianity. They
may be detected in future experiments via pulsar observations.
