Decay of $f(R)$ quintessence into dark matter: mitigating the Hubble tension?
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866912807564345344 |
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| author | Montani, Giovanni Escamilla, Luis A. Carlevaro, Nakia Di Valentino, Eleonora |
| author_facet | Montani, Giovanni Escamilla, Luis A. Carlevaro, Nakia Di Valentino, Eleonora |
| contents | We propose a revised cosmological scenario that extends the $Λ$ Cold Dark Matter ($Λ$CDM) framework by incorporating metric $f(R)$ gravity in the Jordan frame. In this model, the dark energy component arises from a non-minimally coupled scalar field, decomposed into a smooth background (set to unity to recover General Relativity) and a rapidly varying, massive fluctuation that decays into the dark matter sector. In the near-GR limit, this setup provides a phenomenological extension of $Λ$CDM characterized by two additional parameters: the present-day value of the scalar fluctuation and a normalized decay rate. Using a Markov Chain Monte Carlo analysis of low-redshift cosmological data, comprising Type Ia Supernovae, Baryon Acoustic Oscillation (BAO), and Cosmic Chronometer measurements, we find that the proposed model achieves a better overall fit than $Λ$CDM, while the Bayesian evidence remains statistically inconclusive given the inclusion of two extra parameters. The model predicts a moderate increase in the inferred value of $H_0$ and an improved consistency with DESI BAO data when adopting the SH0ES prior. Furthermore, describing dark matter particle creation as a transition phase in the late Universe offers an intriguing physical interpretation, potentially capturing features already present in current data and providing a promising avenue to explore extensions of the standard cosmological model within modified gravity frameworks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_20193 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Decay of $f(R)$ quintessence into dark matter: mitigating the Hubble tension? Montani, Giovanni Escamilla, Luis A. Carlevaro, Nakia Di Valentino, Eleonora Cosmology and Nongalactic Astrophysics We propose a revised cosmological scenario that extends the $Λ$ Cold Dark Matter ($Λ$CDM) framework by incorporating metric $f(R)$ gravity in the Jordan frame. In this model, the dark energy component arises from a non-minimally coupled scalar field, decomposed into a smooth background (set to unity to recover General Relativity) and a rapidly varying, massive fluctuation that decays into the dark matter sector. In the near-GR limit, this setup provides a phenomenological extension of $Λ$CDM characterized by two additional parameters: the present-day value of the scalar fluctuation and a normalized decay rate. Using a Markov Chain Monte Carlo analysis of low-redshift cosmological data, comprising Type Ia Supernovae, Baryon Acoustic Oscillation (BAO), and Cosmic Chronometer measurements, we find that the proposed model achieves a better overall fit than $Λ$CDM, while the Bayesian evidence remains statistically inconclusive given the inclusion of two extra parameters. The model predicts a moderate increase in the inferred value of $H_0$ and an improved consistency with DESI BAO data when adopting the SH0ES prior. Furthermore, describing dark matter particle creation as a transition phase in the late Universe offers an intriguing physical interpretation, potentially capturing features already present in current data and providing a promising avenue to explore extensions of the standard cosmological model within modified gravity frameworks. |
| title | Decay of $f(R)$ quintessence into dark matter: mitigating the Hubble tension? |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2512.20193 |