Reionization History and Neutrino Mass
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arXiv
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| Natura: | Preprint |
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2026
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| _version_ | 1866913110829301760 |
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| author | Dai, YiCheng Liao, Wei |
| author_facet | Dai, YiCheng Liao, Wei |
| contents | Recent baryon acoustic oscillation (BAO) distance measurements, when combined with Cosmic Microwave Background (CMB) observations in the $Λ$CDM framework, lead to a preference for negative neutrino masses. We investigate whether this neutrino mass anomaly can be alleviated by a class of astrophysically motivated reionization histories. Using a frequentist analysis, we find that some reionization histories can move the best-fit value of $\sum m_ν$ to a positive value and bring $\sum m_ν\simeq0.06~{\rm eV}$ into the 95\% confidence interval. To separate the effect of the total optical depth from that of the details of the reionization history, we compare a high-$τ$ history with a two-step tanh-like reionization history of the same $τ$. The resulting $Δχ^2(\sum m_ν)$ profiles are nearly identical. This indicates that the effect is mainly driven by the total optical depth, while the details of the reionization history play only a minor role. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_10116 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Reionization History and Neutrino Mass Dai, YiCheng Liao, Wei Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology Recent baryon acoustic oscillation (BAO) distance measurements, when combined with Cosmic Microwave Background (CMB) observations in the $Λ$CDM framework, lead to a preference for negative neutrino masses. We investigate whether this neutrino mass anomaly can be alleviated by a class of astrophysically motivated reionization histories. Using a frequentist analysis, we find that some reionization histories can move the best-fit value of $\sum m_ν$ to a positive value and bring $\sum m_ν\simeq0.06~{\rm eV}$ into the 95\% confidence interval. To separate the effect of the total optical depth from that of the details of the reionization history, we compare a high-$τ$ history with a two-step tanh-like reionization history of the same $τ$. The resulting $Δχ^2(\sum m_ν)$ profiles are nearly identical. This indicates that the effect is mainly driven by the total optical depth, while the details of the reionization history play only a minor role. |
| title | Reionization History and Neutrino Mass |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2605.10116 |