Self-interacting neutrinos in light of recent CMB and LSS data
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| Format: | Preprint |
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2025
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| author | Poudou, Adèle Simon, Théo Montandon, Thomas Teixeira, Elsa M. Poulin, Vivian |
| author_facet | Poudou, Adèle Simon, Théo Montandon, Thomas Teixeira, Elsa M. Poulin, Vivian |
| contents | We update constraints on a simple model of self-interacting neutrinos involving a heavy scalar mediator with universal flavor coupling. According to past literature, such a model is allowed by Cosmic Microwave Background (CMB) data, with some CMB and large-scale structure data even favoring a strongly-interacting neutrino (SI$ν$) scenario over $Λ$CDM. In this work, we re-evaluate the constraints on this model in light of the new Planck NPIPE data, DESI BAO data, and the Effective Field Theory of Large Scale Structures (EFTofLSS) applied to BOSS data. We find that Planck NPIPE are more permissive to the SI$ν$ scenario and that DESI data favor the SI$ν$ over $Λ$CDM. However, when considering EFTofBOSS data, this mode is no longer preferred. Therefore, new DESI data analyzed under the EFTofLSS are particularly awaited to shed light on this disagreement. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_10485 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Self-interacting neutrinos in light of recent CMB and LSS data Poudou, Adèle Simon, Théo Montandon, Thomas Teixeira, Elsa M. Poulin, Vivian Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology We update constraints on a simple model of self-interacting neutrinos involving a heavy scalar mediator with universal flavor coupling. According to past literature, such a model is allowed by Cosmic Microwave Background (CMB) data, with some CMB and large-scale structure data even favoring a strongly-interacting neutrino (SI$ν$) scenario over $Λ$CDM. In this work, we re-evaluate the constraints on this model in light of the new Planck NPIPE data, DESI BAO data, and the Effective Field Theory of Large Scale Structures (EFTofLSS) applied to BOSS data. We find that Planck NPIPE are more permissive to the SI$ν$ scenario and that DESI data favor the SI$ν$ over $Λ$CDM. However, when considering EFTofBOSS data, this mode is no longer preferred. Therefore, new DESI data analyzed under the EFTofLSS are particularly awaited to shed light on this disagreement. |
| title | Self-interacting neutrinos in light of recent CMB and LSS data |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2503.10485 |