Viability of Big Bang Nucleosynthesis in Some Generalized Horizon Entropies
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866915947530420224 |
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| author | Phukan, Kajal Mazumdar, Rajdeep Malakar, Kalyan Bhuyan, Kalyan |
| author_facet | Phukan, Kajal Mazumdar, Rajdeep Malakar, Kalyan Bhuyan, Kalyan |
| contents | In this work, we investigate the viability of some cosmological models derived from generalized horizon entropies, using Big Bang Nucleosynthesis (BBN) constraints. By analyzing the deviations in the expansion rate, we derive bounds on the model parameters from freeze-out temperature, helium, and deuterium abundances. Our results show that the freeze-out condition provides the most stringent constraint, while helium and deuterium bounds remain consistent across all models. Although lithium constraints are not satisfied, this discrepancy is attributed to the well-known cosmological lithium problem. Furthermore, the parameter values required for late-time cosmic acceleration are found to lie well within the BBN bounds, demonstrating consistency between early- and late-Universe behavior. These results establish the viability of the considered models within the framework of BBN. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_19545 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Viability of Big Bang Nucleosynthesis in Some Generalized Horizon Entropies Phukan, Kajal Mazumdar, Rajdeep Malakar, Kalyan Bhuyan, Kalyan General Relativity and Quantum Cosmology In this work, we investigate the viability of some cosmological models derived from generalized horizon entropies, using Big Bang Nucleosynthesis (BBN) constraints. By analyzing the deviations in the expansion rate, we derive bounds on the model parameters from freeze-out temperature, helium, and deuterium abundances. Our results show that the freeze-out condition provides the most stringent constraint, while helium and deuterium bounds remain consistent across all models. Although lithium constraints are not satisfied, this discrepancy is attributed to the well-known cosmological lithium problem. Furthermore, the parameter values required for late-time cosmic acceleration are found to lie well within the BBN bounds, demonstrating consistency between early- and late-Universe behavior. These results establish the viability of the considered models within the framework of BBN. |
| title | Viability of Big Bang Nucleosynthesis in Some Generalized Horizon Entropies |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2604.19545 |