Scale and redshift dependent limits on cosmic neutrino properties
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866915544193564672 |
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| author | Wang, Deng Mena, Olga Di Valentino, Eleonora Gariazzo, Stefano |
| author_facet | Wang, Deng Mena, Olga Di Valentino, Eleonora Gariazzo, Stefano |
| contents | Cosmological neutrino mass and abundance measurements are reaching unprecedented precision. Testing their stability versus redshift and scale is a crucial issue, as it can serve as a guide for optimizing ongoing and future searches. Here, we perform such analyses, considering a number of redshift, scale, and redshift-and-scale nodes. Concerning the $k$-space analysis of $\sum m_ν$, CMB observations are crucial, as they lead the neutrino mass constraints. Interestingly, some data combinations suggest a non-zero value for the neutrino mass with $2σ$ significance. The most constraining bound we find is $\sum m_ν<0.54$ eV at $95\%$ CL in the $[10^{-3}, 10^{-2}]$ $h$/Mpc $k$-bin, a limit that barely depends on the data combination. Regarding the redshift- and scale-dependent neutrino mass constraints, high redshifts ($z>100$) and scales in the range $[10^{-3}, 10^{-1}]$ $h$/Mpc provide the best constraints. The least constraining bounds are obtained at very low redshifts $[0,0.5]$ and also at very small scales ($k>0.1\, h$/Mpc), due to the absence of observations. Highly relevant is the case of the $[100, 1100]$, $[10^{-2}, 10^{-1}]$ $h$/Mpc redshift-scale bin, where a $2$-$3σ$ evidence for a non-zero neutrino mass is obtained for all data combinations. The bound from CMB alone at $68\%$ CL is $0.63^{+0.20}_{-0.24}$ eV, and the one for the full dataset is $0.56^{+0.20}_{-0.23}$ eV, clearly suggesting a non-zero neutrino mass at these scales, possibly related to a deviation of the ISW amplitude in this redshift range. Concerning the analysis of $N_{\rm eff}$ in the $k$-space, at intermediate scales ranging from $k=10^{-3}$ $h$/Mpc to $k=10^{-1}$ $h$/Mpc, accurate CMB data provide very strong bounds, the most robust one being $N_{\rm eff}=3.09\pm 0.14$, comparable to the standard expected value without a $k$-bin analysis. [abridged] |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_18745 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Scale and redshift dependent limits on cosmic neutrino properties Wang, Deng Mena, Olga Di Valentino, Eleonora Gariazzo, Stefano Cosmology and Nongalactic Astrophysics Cosmological neutrino mass and abundance measurements are reaching unprecedented precision. Testing their stability versus redshift and scale is a crucial issue, as it can serve as a guide for optimizing ongoing and future searches. Here, we perform such analyses, considering a number of redshift, scale, and redshift-and-scale nodes. Concerning the $k$-space analysis of $\sum m_ν$, CMB observations are crucial, as they lead the neutrino mass constraints. Interestingly, some data combinations suggest a non-zero value for the neutrino mass with $2σ$ significance. The most constraining bound we find is $\sum m_ν<0.54$ eV at $95\%$ CL in the $[10^{-3}, 10^{-2}]$ $h$/Mpc $k$-bin, a limit that barely depends on the data combination. Regarding the redshift- and scale-dependent neutrino mass constraints, high redshifts ($z>100$) and scales in the range $[10^{-3}, 10^{-1}]$ $h$/Mpc provide the best constraints. The least constraining bounds are obtained at very low redshifts $[0,0.5]$ and also at very small scales ($k>0.1\, h$/Mpc), due to the absence of observations. Highly relevant is the case of the $[100, 1100]$, $[10^{-2}, 10^{-1}]$ $h$/Mpc redshift-scale bin, where a $2$-$3σ$ evidence for a non-zero neutrino mass is obtained for all data combinations. The bound from CMB alone at $68\%$ CL is $0.63^{+0.20}_{-0.24}$ eV, and the one for the full dataset is $0.56^{+0.20}_{-0.23}$ eV, clearly suggesting a non-zero neutrino mass at these scales, possibly related to a deviation of the ISW amplitude in this redshift range. Concerning the analysis of $N_{\rm eff}$ in the $k$-space, at intermediate scales ranging from $k=10^{-3}$ $h$/Mpc to $k=10^{-1}$ $h$/Mpc, accurate CMB data provide very strong bounds, the most robust one being $N_{\rm eff}=3.09\pm 0.14$, comparable to the standard expected value without a $k$-bin analysis. [abridged] |
| title | Scale and redshift dependent limits on cosmic neutrino properties |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2503.18745 |