Formation of supermassive primordial black holes by Affleck-Dine mechanism

We study the supermassive black holes (SMBHs) observed in the galactic centers. Although the origin of SMBHs is not well understood yet, previous studies suggest that seed black holes (BHs) with masses 10(4-5) M-circle dot exist at a high redshift (z similar to 10). We examine whether primordial black holes (PBHs) produced by inhomogeneous baryogenesis can explain those seed black holes. Inhomogeneous baryogenesis is realized in the modified Affleck-Dine mechanism. In this scenario, there is no stringent constraint from cosmic microwave background mu-distortion in contrast to the scenario where Gaussian fluctuations collapse into PBHs. It is found that the model can account for the origin of the seed BHs of the SMBHs.