Gravothermalizing into primordial black holes, boson stars, and cannibal stars
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| Format: | Preprint |
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2024
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| _version_ | 1866917014108372992 |
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| author | Ralegankar, Pranjal Perri, Daniele Kobayashi, Takeshi |
| author_facet | Ralegankar, Pranjal Perri, Daniele Kobayashi, Takeshi |
| contents | Very little is known about the cosmological history from after the end of inflation until Big Bang Nucleosynthesis. Various well-motivated models predict that the universe could have undergone a period of matter domination in this early epoch. We demonstrate that if the particles causing matter domination have self-interactions, they can form halos that undergo a gravothermal collapse. We thus propose a novel scenario for the formation of primordial black holes, which in particular can lie within the asteroid-mass range. We also find that it is not only black holes that can form in the aftermath of a gravothermal evolution. We show that number-changing annihilations of the particles can create sufficient heat to halt the gravothermal evolution, thus forming a ``cannibal star''. Likewise, the pressure from the particle's repulsive self-interactions can form a boson star during a gravothermal evolution. Thus, our study highlights that structure formation in the early universe can have a rich phenomenology. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_18948 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Gravothermalizing into primordial black holes, boson stars, and cannibal stars Ralegankar, Pranjal Perri, Daniele Kobayashi, Takeshi Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology Very little is known about the cosmological history from after the end of inflation until Big Bang Nucleosynthesis. Various well-motivated models predict that the universe could have undergone a period of matter domination in this early epoch. We demonstrate that if the particles causing matter domination have self-interactions, they can form halos that undergo a gravothermal collapse. We thus propose a novel scenario for the formation of primordial black holes, which in particular can lie within the asteroid-mass range. We also find that it is not only black holes that can form in the aftermath of a gravothermal evolution. We show that number-changing annihilations of the particles can create sufficient heat to halt the gravothermal evolution, thus forming a ``cannibal star''. Likewise, the pressure from the particle's repulsive self-interactions can form a boson star during a gravothermal evolution. Thus, our study highlights that structure formation in the early universe can have a rich phenomenology. |
| title | Gravothermalizing into primordial black holes, boson stars, and cannibal stars |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2410.18948 |