Self-Interacting Neutrinos in Light of Large-Scale Structure Data
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866929366629351424 |
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| author | He, Adam An, Rui Ivanov, Mikhail M. Gluscevic, Vera |
| author_facet | He, Adam An, Rui Ivanov, Mikhail M. Gluscevic, Vera |
| contents | We explore a self-interacting neutrino cosmology in which neutrinos experience a delayed onset of free-streaming. We use the effective field theory of large-scale structure (LSS) to model matter distribution on mildly non-linear scales within the self-interacting neutrino cosmology for the first time. We perform the first combined likelihood analysis of BOSS full-shape galaxy clustering, weak lensing, and Lyman-$α$ forest measurements, together with the cosmic microwave background (CMB) data from Planck. We find that the full data set strongly favors presence of a flavor-universal neutrino self-interaction, with a characteristic energy scale of order $10$ MeV. The preference is at the $\sim 5σ$ level and is primarily driven by the Lyman-$α$ forest measurements and, to a lesser extent, the weak lensing data from DES. The self-interacting neutrino model eases both the Hubble tension and the $S_8$ tension between different cosmological data sets, but it does not resolve either. Finally, we note a preference for a non-zero sum of neutrino masses at the level of $\sim 0.3$ eV under this model, consistent with previous bounds. These results call for further investigation in several directions, and may have significant implications for neutrino physics and for future new-physics searches with galaxy surveys. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_03956 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Self-Interacting Neutrinos in Light of Large-Scale Structure Data He, Adam An, Rui Ivanov, Mikhail M. Gluscevic, Vera Cosmology and Nongalactic Astrophysics We explore a self-interacting neutrino cosmology in which neutrinos experience a delayed onset of free-streaming. We use the effective field theory of large-scale structure (LSS) to model matter distribution on mildly non-linear scales within the self-interacting neutrino cosmology for the first time. We perform the first combined likelihood analysis of BOSS full-shape galaxy clustering, weak lensing, and Lyman-$α$ forest measurements, together with the cosmic microwave background (CMB) data from Planck. We find that the full data set strongly favors presence of a flavor-universal neutrino self-interaction, with a characteristic energy scale of order $10$ MeV. The preference is at the $\sim 5σ$ level and is primarily driven by the Lyman-$α$ forest measurements and, to a lesser extent, the weak lensing data from DES. The self-interacting neutrino model eases both the Hubble tension and the $S_8$ tension between different cosmological data sets, but it does not resolve either. Finally, we note a preference for a non-zero sum of neutrino masses at the level of $\sim 0.3$ eV under this model, consistent with previous bounds. These results call for further investigation in several directions, and may have significant implications for neutrino physics and for future new-physics searches with galaxy surveys. |
| title | Self-Interacting Neutrinos in Light of Large-Scale Structure Data |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2309.03956 |