Kavli Affiliate: Masahiro Kawasaki
| First 5 Authors: Kentaro Kasai, Masahiro Kawasaki, Kai Murai, Shunsuke Neda,
| Summary:
We study a primordial black hole (PBH) formation model based on the framework
of the inhomogeneous Affleck-Dine (AD) mechanism, which can explain the seeds
of supermassive black holes (SMBHs). This model, however, predicts strong
clustering of SMBHs that is inconsistent with the observation of angular
correlation of quasars. In this paper, we propose a modified model that can
significantly reduce the PBH clustering on large scales by considering a
time-dependent Hubble-induced mass during inflation. The quasar angular
correlation is suppressed by the large Hubble-induced mass in the early stage
of inflation while the small Hubble-induced mass in the late stage leads to the
AD field fluctuations large enough for PBH formation as in the original model.
As a result, the modified scenario can successfully explain the seeds of SMBHs.
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