Primordial Black Holes from Affleck-Dine Mechanism

Understand

The recent observations of the gravitational waves (GWs) by LIGO-Virgo collaboration infer the increasing possibility of the primordial black holes (PBHs).

• Recently it was pointed out that sufficient PBHs are produced by the Affleck-Dine mechanism where inhomogeneous baryogenesis takes place due to change of the Hubble induced mass during and after inflation and forms high baryon bubbles (HBBs).
• The produced HBBs have large density contrasts through the QCD phase transition or stable Q-ball formation, which leads to formation of the LIGO PBHs.
• Furthermore, in this model stringent constraints from CMB $\mu$-distortion and pulsar timing array (PTA) experiments are completely absent.