Primordial black hole reformation in the early Universe
Primordial black holes (PBH) can arise in a wide range of scenarios, from inflation to first-order phase transitions. Light PBHs, such as those produced during preheating, in bounce cosmologies, or at the GUT scale, could induce an early matter-dominated phase given a moderate initial abundance. Dur...
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| Format: | Article |
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Elsevier
2025-06-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269325002497 |
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| author | TaeHun Kim Philip Lu |
| author_facet | TaeHun Kim Philip Lu |
| author_sort | TaeHun Kim |
| collection | DOAJ |
| description | Primordial black holes (PBH) can arise in a wide range of scenarios, from inflation to first-order phase transitions. Light PBHs, such as those produced during preheating, in bounce cosmologies, or at the GUT scale, could induce an early matter-dominated phase given a moderate initial abundance. During the early matter domination, the growth of initial PBH density perturbations can trigger collapse on horizon scales, producing much heavier PBHs. While the remaining original PBHs evaporate and reheat the Universe, these massive reformed PBHs survive for an extended period of time, producing potentially observable signatures at the present. We study this PBH reformation scenario and show that those reformed PBHs can emit significant quantities of γ-rays detectable by the next generation of experiments. The rapid reheating after matter domination generates a coincident stochastic gravitational wave background, which could be within the range of the upcoming CMB-S4 experiment. The PBH reformation scenario provides an intriguing possibility of decoupling the current PBH population and the initial formation mechanism from early Universe physics, while providing opportunities for observation through multi-messenger astronomy. |
| format | Article |
| id | doaj-art-4a891886e1e84fb1a4f02f9fa4e2db17 |
| institution | Kabale University |
| issn | 0370-2693 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj-art-4a891886e1e84fb1a4f02f9fa4e2db172025-08-20T03:48:51ZengElsevierPhysics Letters B0370-26932025-06-0186513948810.1016/j.physletb.2025.139488Primordial black hole reformation in the early UniverseTaeHun Kim0Philip Lu1School of Physics, Korea Institute for Advanced Study, 85 Hoegi-ro, Dongdaemun-gu, Seoul 02455, Republic of KoreaCorresponding author.; School of Physics, Korea Institute for Advanced Study, 85 Hoegi-ro, Dongdaemun-gu, Seoul 02455, Republic of KoreaPrimordial black holes (PBH) can arise in a wide range of scenarios, from inflation to first-order phase transitions. Light PBHs, such as those produced during preheating, in bounce cosmologies, or at the GUT scale, could induce an early matter-dominated phase given a moderate initial abundance. During the early matter domination, the growth of initial PBH density perturbations can trigger collapse on horizon scales, producing much heavier PBHs. While the remaining original PBHs evaporate and reheat the Universe, these massive reformed PBHs survive for an extended period of time, producing potentially observable signatures at the present. We study this PBH reformation scenario and show that those reformed PBHs can emit significant quantities of γ-rays detectable by the next generation of experiments. The rapid reheating after matter domination generates a coincident stochastic gravitational wave background, which could be within the range of the upcoming CMB-S4 experiment. The PBH reformation scenario provides an intriguing possibility of decoupling the current PBH population and the initial formation mechanism from early Universe physics, while providing opportunities for observation through multi-messenger astronomy.http://www.sciencedirect.com/science/article/pii/S0370269325002497 |
| spellingShingle | TaeHun Kim Philip Lu Primordial black hole reformation in the early Universe Physics Letters B |
| title | Primordial black hole reformation in the early Universe |
| title_full | Primordial black hole reformation in the early Universe |
| title_fullStr | Primordial black hole reformation in the early Universe |
| title_full_unstemmed | Primordial black hole reformation in the early Universe |
| title_short | Primordial black hole reformation in the early Universe |
| title_sort | primordial black hole reformation in the early universe |
| url | http://www.sciencedirect.com/science/article/pii/S0370269325002497 |
| work_keys_str_mv | AT taehunkim primordialblackholereformationintheearlyuniverse AT philiplu primordialblackholereformationintheearlyuniverse |