Probing Inflationary Origins of Primordial Black Holes with LIGO--Virgo--KAGRA O1--O4a data
Large primordial curvature perturbations not only produce primordial black holes (PBHs) but also inevitably source a scalar-induced stochastic gravitational-wave background upon horizon reentry. We analyze the combined LIGO--Virgo--KAGRA O1--O4a data to constrain two representative inflationary mechanisms for generatin...