Speaker
Ms
Michiru Uwabo
(IBS CTPU-CGA)
Description
Spherical collapse is assumed in most of the works on PBH formation from
the primordial curvature perturbation. According to the peak theory[1],
sufficiently high peaks of a Gaussian random scalar field statistically have
spherical symmetric shapes in the homogeneous and isotropic universe,
which guarantees the above assumption. However, the PBH formation is
related to highly non-linear regime of the perturbation and the non-
Gaussianity may play an important role. In the talk, I will explicitly show how
this argument can be modified if the curvature perturbation obeys non-
Gaussianity.
