Description
Primordial Black Holes (PBHs) have become one of the most exciting
topics in cosmology.
They are presumably formed from rare, large curvature perturbations on
scales that can't be accessed by CMB and large scale structure
observations.
If PBHs exist, they will lead to many interesting observational phenomena.
Among them are the induced gravitational waves (IGWs) that may be
detectable in various frequencies.
In this talk, I will first review the IGW phenomenology in the PBH scenario.
Then I will focus on the IGWs from the PBH isocurvature perturbation,
and discuss their predicted features.