Seminarium "High Energy, Cosmology and Astro-particle Physics (HECA)"
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2025-03-18 (11:15) 
(Tohoku University)
Primordial black hole formation by inverted bubble collapse
Kodai Sakurai
ONLINE SEMINAR !!!
https://uw-edu-pl.zoom.us/j/5613854348
A primordial black hole (PBH) is one of the promising candidates for dark matter. PBHs can form when significant density perturbations are generated in the early Universe. Various mechanisms for producing overdense regions that lead to PBH formation have been proposed in the literature. Many of these mechanisms postulate that such an overdense region has spherical symmetry; however, in general, deviations from a perfect sphere can occur, making PBH formation nontrivial. In this talk, we discuss a novel mechanism for PBH formation in which the generated overdense region maintains spherical symmetry. We also demonstrate that the observed microlensing events in the OGLE and Subaru HSC data can be explained by applying this new mechanism to extended Higgs models.
https://uw-edu-pl.zoom.us/j/5613854348
A primordial black hole (PBH) is one of the promising candidates for dark matter. PBHs can form when significant density perturbations are generated in the early Universe. Various mechanisms for producing overdense regions that lead to PBH formation have been proposed in the literature. Many of these mechanisms postulate that such an overdense region has spherical symmetry; however, in general, deviations from a perfect sphere can occur, making PBH formation nontrivial. In this talk, we discuss a novel mechanism for PBH formation in which the generated overdense region maintains spherical symmetry. We also demonstrate that the observed microlensing events in the OGLE and Subaru HSC data can be explained by applying this new mechanism to extended Higgs models.