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 has not been well understood yet,
previous studies suggest that seed black holes (BHs) with masses
$10^{4-5}M_\odot$ exist at a high redshift ($z \sim 10$). We examine whether
primordial black holes (PBHs) produced by inhomogeneous baryogenesis can
explain those seed black holes. The inhomogeneous baryogenesis is realized in
the modified Affleck-Dine mechanism. In this scenario, there is no stringent
constraint from CMB $\mu$-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.
