The cosmological Mass Varying Neutrino model in the late universe
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866917323250597888 |
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| author | Avsajanishvili, Olga |
| author_facet | Avsajanishvili, Olga |
| contents | The cosmological Mass Varying Neutrino (MaVaN) model is considered, where the interaction between a fermionic field and a scalar field with a Ratra-Peebles potential via a Yukawa coupling is investigated. Observational constraints on the flat and non-flat MaVaN models, as well as on the standard $Λ$CDM model, are derived from 32 $H(z)$ measurements using MCMC analysis. Comparison with the $Λ$CDM model using the criteria $Δχ^2_{\rm min}$, $AICc$, and $BIC$ shows no statistically significant improvement for MaVaN models. Deviations in the expansion history remain well below $1σ$, indicating that the $H(z)$ data alone do not provide sufficient constraining power to distinguish MaVaN models from the $Λ$CDM model. The non-flat MaVaN model reduces the tension between the $H_0$ value inferred from $H(z)$ data and the Planck CMB measurement from $\sim 2σ$ in the $Λ$CDM framework to $\sim 1.1σ$. The discrepancy with the SH0ES measurement of $H_0$ is also reduced to below $1σ$, primarily due to the large uncertainties of the $H(z)$ data. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2502_13097 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The cosmological Mass Varying Neutrino model in the late universe Avsajanishvili, Olga Cosmology and Nongalactic Astrophysics The cosmological Mass Varying Neutrino (MaVaN) model is considered, where the interaction between a fermionic field and a scalar field with a Ratra-Peebles potential via a Yukawa coupling is investigated. Observational constraints on the flat and non-flat MaVaN models, as well as on the standard $Λ$CDM model, are derived from 32 $H(z)$ measurements using MCMC analysis. Comparison with the $Λ$CDM model using the criteria $Δχ^2_{\rm min}$, $AICc$, and $BIC$ shows no statistically significant improvement for MaVaN models. Deviations in the expansion history remain well below $1σ$, indicating that the $H(z)$ data alone do not provide sufficient constraining power to distinguish MaVaN models from the $Λ$CDM model. The non-flat MaVaN model reduces the tension between the $H_0$ value inferred from $H(z)$ data and the Planck CMB measurement from $\sim 2σ$ in the $Λ$CDM framework to $\sim 1.1σ$. The discrepancy with the SH0ES measurement of $H_0$ is also reduced to below $1σ$, primarily due to the large uncertainties of the $H(z)$ data. |
| title | The cosmological Mass Varying Neutrino model in the late universe |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2502.13097 |