New Venues in Formation and Detection for Primordial Black Hole Dark
  Matter
  Primordial black holes (PBHs) are not as exotic as once thought and
constitute a compelling non-particle dark matter (DM) candidate. We present a
novel general PBH formation mechanism from scalar field fragmentation, which
does not suffer from the inflaton potential fine-tuning that plagues many of
the standard PBH formation models. We discuss how interactions of compact stars
with very small sub-lunar/asteroid-size PBHs, which reside in the open window
of parameter space where PBHs can constitute all of DM, allow for a slew of new
astrophysical signatures that could shed light on PBH DM and are particularly
interesting in the era of multi-messenger astronomy.
