Speaker
Shi Pi
(ITP, CAS)
Description
Primordial black holes (PBHs) may form when the high peaks of the primordial density perturbation re-enter the Hubble horizon, while at the same time gravitational waves induced by the density perturbation at second order are generated. Currently observational constraints make it possible for asteroid-mass PBHs to be all dark matter, whose concomitant induced GWs are in the millihertz band. I will show that if all or a large portion of the PBHs are composed of dark matter, the corresponding induced gravitational wave energy spectrum must be detectable by space-borne interferometers like LISA, irrespective of linear local non-Gaussianity of the scalar perturbation.
Primary author
Shi Pi
(ITP, CAS)
