Planck isocurvature constraint on primordial black holes lighter than a kiloton
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866915373032407040 |
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| author | Kim, TaeHun Gong, Jinn-Ouk Jeong, Donghui Jung, Dong-Won Kim, Yeong Gyun Lee, Kang Young |
| author_facet | Kim, TaeHun Gong, Jinn-Ouk Jeong, Donghui Jung, Dong-Won Kim, Yeong Gyun Lee, Kang Young |
| contents | We demonstrate that primordial black holes (PBHs) lighter than $10^9 \, \text{g}$, which evaporated before the Big Bang nucleosynthesis, can induce significant isocurvature perturbations due to their biased clustering amplitude and the branching ratio of the Hawking radiation differing from the abundance ratio. By leveraging the upper bound on the isocurvature perturbations from the cosmic microwave background anisotropies reported by the Planck collaboration, we derive a new upper bound on the abundance of these light PBHs. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_14581 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Planck isocurvature constraint on primordial black holes lighter than a kiloton Kim, TaeHun Gong, Jinn-Ouk Jeong, Donghui Jung, Dong-Won Kim, Yeong Gyun Lee, Kang Young Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology We demonstrate that primordial black holes (PBHs) lighter than $10^9 \, \text{g}$, which evaporated before the Big Bang nucleosynthesis, can induce significant isocurvature perturbations due to their biased clustering amplitude and the branching ratio of the Hawking radiation differing from the abundance ratio. By leveraging the upper bound on the isocurvature perturbations from the cosmic microwave background anisotropies reported by the Planck collaboration, we derive a new upper bound on the abundance of these light PBHs. |
| title | Planck isocurvature constraint on primordial black holes lighter than a kiloton |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2503.14581 |