Non-Minimally Coupled Quintessence in Light of DESI
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arXiv
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| Natura: | Preprint |
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2025
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| author | López, Samuel Sánchez Karam, Alexandros Hazra, Dhiraj Kumar |
| author_facet | López, Samuel Sánchez Karam, Alexandros Hazra, Dhiraj Kumar |
| contents | We analyze a model of quintessence governed by an exponential potential and non-minimally coupled to gravity, in light of recent datasets, including cosmic microwave background, baryon acoustic oscillations, and supernovae distance moduli observations. Mainly focusing on the Palatini formulation of gravity, a phase space analysis reveals the existence of a late-time stable de Sitter attractor as long as the non-minimal coupling constant is negative, regardless of the value of the slope of the exponential. Fitting to CMB+DESI+DESY5 data, we find strong evidence for our model over $Λ$CDM, with a Bayes factor $\log B = 5.52$. Furthermore, the data seem to prefer dynamical dark energy at $>3σ$ C.L. and a phantom crossing in the barotropic parameter of dark energy at $2-3σ$ C.L.. We find that the scalar field dynamics in the Palatini formalism provides marginally better agreement to the data compared to the metric formalism. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_14941 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Non-Minimally Coupled Quintessence in Light of DESI López, Samuel Sánchez Karam, Alexandros Hazra, Dhiraj Kumar Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory We analyze a model of quintessence governed by an exponential potential and non-minimally coupled to gravity, in light of recent datasets, including cosmic microwave background, baryon acoustic oscillations, and supernovae distance moduli observations. Mainly focusing on the Palatini formulation of gravity, a phase space analysis reveals the existence of a late-time stable de Sitter attractor as long as the non-minimal coupling constant is negative, regardless of the value of the slope of the exponential. Fitting to CMB+DESI+DESY5 data, we find strong evidence for our model over $Λ$CDM, with a Bayes factor $\log B = 5.52$. Furthermore, the data seem to prefer dynamical dark energy at $>3σ$ C.L. and a phantom crossing in the barotropic parameter of dark energy at $2-3σ$ C.L.. We find that the scalar field dynamics in the Palatini formalism provides marginally better agreement to the data compared to the metric formalism. |
| title | Non-Minimally Coupled Quintessence in Light of DESI |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2510.14941 |