Kavli Affiliate: Misao Sasaki
| First 5 Authors: Xinpeng Wang, Misao Sasaki, Ying-li Zhang, ,
| Summary:
We report a novel mechanism where two families of primordial black holes
(PBHs) may form at nearly the same comoving scales but at two different epochs.
It is realized in two-stage inflation where a non-inflationary stage is
sandwiched by the two inflationary stages. In this case, smaller PBHs form when
the comoving scale of interest re-enters the horizon during the break period,
and larger PBHs form when the scale re-enters the horizon after inflation. This
mechanism may realize both reheating of the universe through the evaporation of
ultralight PBHs formed during the break stage and the dark matter by those
formed after inflation. We show that this scenario may give rise to a
distinctive signature in the stochastic gravitational wave background that can
be tested by the near-future gravitational wave observatories such as LISA and
DECIGO. Our work thus provides a unified observational window into the physics
of inflation, reheating, and dark matter.
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