Neutrinophilic $\mathbfΛ$CDM Extension for EMPRESS, DESI and Hubble Tension
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arXiv
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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866915117496532992 |
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| author | Li, Yuan-Zhen Yu, Jiang-Hao |
| author_facet | Li, Yuan-Zhen Yu, Jiang-Hao |
| contents | A number of recent cosmological observations have indicated the presence of new physics beyond the $\mathbfΛ$CDM model. Combining observations from EMPRESS on helium abundance and DESI on baryon acoustic oscillations with Hubble tension, we show that all of them can be explained concurrently with a extension of the $\mathbfΛ$CDM model with primordial neutrino asymmetry $ξ_ν$ and additional contribution to the effective number of neutrinos $δN_{\rm eff}$. Based on the accurate treatments of neutrino decoupling and BBN processes, we present state-of-the-art constraints on neutrino asymmetry for the fixed or varying $N_{\rm eff}$. Comparing different extensions of the $\mathbfΛ$CDM model, we show that the neutrinophilic $\mathbfΛ$CDM extension with $ξ_ν = 0.056 \pm 0.017 $ and $δN_{\rm eff} = 0.41 \pm 0.16$ is preferred by current observations, while the Hubble tension in this model is also alleviated to be $2.2 σ$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_13153 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Neutrinophilic $\mathbfΛ$CDM Extension for EMPRESS, DESI and Hubble Tension Li, Yuan-Zhen Yu, Jiang-Hao High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics A number of recent cosmological observations have indicated the presence of new physics beyond the $\mathbfΛ$CDM model. Combining observations from EMPRESS on helium abundance and DESI on baryon acoustic oscillations with Hubble tension, we show that all of them can be explained concurrently with a extension of the $\mathbfΛ$CDM model with primordial neutrino asymmetry $ξ_ν$ and additional contribution to the effective number of neutrinos $δN_{\rm eff}$. Based on the accurate treatments of neutrino decoupling and BBN processes, we present state-of-the-art constraints on neutrino asymmetry for the fixed or varying $N_{\rm eff}$. Comparing different extensions of the $\mathbfΛ$CDM model, we show that the neutrinophilic $\mathbfΛ$CDM extension with $ξ_ν = 0.056 \pm 0.017 $ and $δN_{\rm eff} = 0.41 \pm 0.16$ is preferred by current observations, while the Hubble tension in this model is also alleviated to be $2.2 σ$. |
| title | Neutrinophilic $\mathbfΛ$CDM Extension for EMPRESS, DESI and Hubble Tension |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2501.13153 |