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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2402.13186 |
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| _version_ | 1866917386875043840 |
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| author | Choi, Jeongyoon Jang, Dukjae Kwon, Youngshin Seong, Gwangeon Mun, Myeong Hwan Kim, Young-Min Kwak, Kyujin Cheoun, Myung-Ki |
| author_facet | Choi, Jeongyoon Jang, Dukjae Kwon, Youngshin Seong, Gwangeon Mun, Myeong Hwan Kim, Young-Min Kwak, Kyujin Cheoun, Myung-Ki |
| contents | We investigate the evolution of non-extensivity in the photon distribution during the Big Bang Nucleosynthesis (BBN) epoch using Tsallis statistics. Assuming a minimal deviation from the Planck distribution, we construct the perturbed Boltzmann equation for photons, including the collision terms for pair creation and annihilation processes. We analyze the possibility that these collisions could cause a slight increase in the number of high-frequency photons within the BBN era, and consequently, the primordial plasma might be temporarily placed in a state of chemical non-equilibrium. We also discuss the restoration of the photon distribution to an equilibrium state as the Universe enters the matter-dominated era. These findings, which suggest possible changes in the photon distribution during the epoch between the BBN and the recombination, offer insights that support the previously proposed ansatz solution to the primordial lithium problem in arXiv:1812.09472. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_13186 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Effects of pair freeze-out on photon distributions in BBN epoch Choi, Jeongyoon Jang, Dukjae Kwon, Youngshin Seong, Gwangeon Mun, Myeong Hwan Kim, Young-Min Kwak, Kyujin Cheoun, Myung-Ki Cosmology and Nongalactic Astrophysics We investigate the evolution of non-extensivity in the photon distribution during the Big Bang Nucleosynthesis (BBN) epoch using Tsallis statistics. Assuming a minimal deviation from the Planck distribution, we construct the perturbed Boltzmann equation for photons, including the collision terms for pair creation and annihilation processes. We analyze the possibility that these collisions could cause a slight increase in the number of high-frequency photons within the BBN era, and consequently, the primordial plasma might be temporarily placed in a state of chemical non-equilibrium. We also discuss the restoration of the photon distribution to an equilibrium state as the Universe enters the matter-dominated era. These findings, which suggest possible changes in the photon distribution during the epoch between the BBN and the recombination, offer insights that support the previously proposed ansatz solution to the primordial lithium problem in arXiv:1812.09472. |
| title | Effects of pair freeze-out on photon distributions in BBN epoch |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2402.13186 |