Constraints on the lepton asymmetry from DESI DR2 BAO data
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866918249334046720 |
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| author | Zhao, Zhi-Chao Xia, Dong-Mei Wang, Sai |
| author_facet | Zhao, Zhi-Chao Xia, Dong-Mei Wang, Sai |
| contents | It is important to explore the potential existence of lepton asymmetry in the neutrino sector. Conducting a joint analysis of DESI DR2 BAO data and \emph{Planck} 2018 CMB data, we obtain the upper limits on the neutrino degeneracy parameter, i.e., $ξ<0.56$ for the normal mass hierarchy while $ξ<0.62$ for the inverted mass hierarchy, at 95\% confidence level. Considering the influence of the dynamical dark energy, we find that these upper limits remain to be robust. This work may provide helpful implications for model buildings of the matter-antimatter asymmetry in the universe. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_09624 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Constraints on the lepton asymmetry from DESI DR2 BAO data Zhao, Zhi-Chao Xia, Dong-Mei Wang, Sai Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology It is important to explore the potential existence of lepton asymmetry in the neutrino sector. Conducting a joint analysis of DESI DR2 BAO data and \emph{Planck} 2018 CMB data, we obtain the upper limits on the neutrino degeneracy parameter, i.e., $ξ<0.56$ for the normal mass hierarchy while $ξ<0.62$ for the inverted mass hierarchy, at 95\% confidence level. Considering the influence of the dynamical dark energy, we find that these upper limits remain to be robust. This work may provide helpful implications for model buildings of the matter-antimatter asymmetry in the universe. |
| title | Constraints on the lepton asymmetry from DESI DR2 BAO data |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2504.09624 |