New thresholds for Primordial Black Hole formation during the QCD phase transition
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2016
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| _version_ | 1866914748301312000 |
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| author | Sobrinho, J. L. G. Augusto, P. Gonçalves, A. L. |
| author_facet | Sobrinho, J. L. G. Augusto, P. Gonçalves, A. L. |
| contents | Primordial Black Holes (PBHs) might have formed in the early Universe as a consequence of the collapse of density fluctuations with an amplitude above a critical value $δ_{c}$: the formation threshold. Although for a radiation-dominated Universe $δ_{c}$ remains constant, if the Universe experiences some dust-like phases (e.g. phase transitions) $δ_{c}$ might decrease, improving the chances of PBH formation. We studied the evolution of $δ_{c}$ during the QCD phase transition epoch within three different models: Bag Model (BM), Lattice Fit Model (LFM), and Crossover Model (CM). We found that the reduction on the background value of $δ_{c}$ can be as high as $77\%$ (BM), which might imply a $\sim10^{-10}$ probability of PBHs forming at the QCD epoch. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1609_01205 |
| institution | arXiv |
| publishDate | 2016 |
| record_format | arxiv |
| spellingShingle | New thresholds for Primordial Black Hole formation during the QCD phase transition Sobrinho, J. L. G. Augusto, P. Gonçalves, A. L. Cosmology and Nongalactic Astrophysics Primordial Black Holes (PBHs) might have formed in the early Universe as a consequence of the collapse of density fluctuations with an amplitude above a critical value $δ_{c}$: the formation threshold. Although for a radiation-dominated Universe $δ_{c}$ remains constant, if the Universe experiences some dust-like phases (e.g. phase transitions) $δ_{c}$ might decrease, improving the chances of PBH formation. We studied the evolution of $δ_{c}$ during the QCD phase transition epoch within three different models: Bag Model (BM), Lattice Fit Model (LFM), and Crossover Model (CM). We found that the reduction on the background value of $δ_{c}$ can be as high as $77\%$ (BM), which might imply a $\sim10^{-10}$ probability of PBHs forming at the QCD epoch. |
| title | New thresholds for Primordial Black Hole formation during the QCD phase transition |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/1609.01205 |