EPJ Web Conf.
Volume 260, 2022The 16th International Symposium on Nuclei in the Cosmos (NIC-XVI)
|Number of page(s)||4|
|Published online||24 February 2022|
Light Element Abundances Constrain Primordial Black Holes in the Critical Collapse Model
1 Jockey Club Institute for Advanced Study, The HongKong University of Science andTechnology, HongKong S.A.R., China
2 Graduate Schoolof Science, The UniversityofTokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
3 National Astronomical Observatoryof Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
4 School of Physics, International Research Center for Big-Bang Cosmology and Element Genesis, Beihang University, 37, Xueyuan Rd., Haidian-qu, Beijing 100083 China
Published online: 24 February 2022
We study the photodisintegration process triggered by the nonthermal electromagnetic Hawking radiation from primordial black holes (PBHs) in the critical collapse model. The presence of a low-mass tail of critical collapse mass function could enhance energetic photon emissions from Hawking radiation of PBHs. Nuclear photodisintegration rates are calculated with a non-thermal photon spectrum derivedby solving the Boltzmann equation iteratively. Withthenewest observational limitonthe3Heabundancein GalacticHII regions, the updated 3He constraints on PBH mass spectrum in the horizon mass range 1012–1013gare derived. Our results showthat3He constraints on the critical mass function are about one order of magnitude severer than the monochromatic one, although the fraction of PBHs in the low-mass tail region is relatively small.
© The Authors, published by EDP Sciences, 2022
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