May 27 – 31, 2024
UB Physics Faculty
Europe/Madrid timezone

Peak theory and non-Gaussianity [Chair: Garriga]

May 30, 2024, 4:30 PM
Room N06 (UB Physics Faculty)

Room N06

UB Physics Faculty

Martí i Franquès, 1, 11 08028 Barcelona


Michiru Uwabo (IBS-CTPU-CGA, Ochanomizu Univ.)


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.
[1] Bardeen et al. Astrophys.J. 304 (1986) 15-61

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Primary author

Michiru Uwabo (IBS-CTPU-CGA, Ochanomizu Univ.)

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