Non-minimally coupled gravity constraints from DESI DR2 data
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arXiv
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866918477603799040 |
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| author | Pan, Jiaming Ye, Gen |
| author_facet | Pan, Jiaming Ye, Gen |
| contents | It has been observed that the hint about dynamical dark energy in the DESI BAO observation might point to non-minimally coupled gravity. We report the first $3σ$ evidence for non-minimal coupling in a model-agnostic effective field theory (EFT) approach. In a non-parametric reconstruction approach, we detect a clear departure from the General Relativity expectation of non-minimal coupling based on a combined analysis of DESI DR2 BAO together with CMB and Type Ia supernova data. Also, it is found that current data can constrain up to the quadratic order $(n=2)$ if the EFT function representing non-minimal coupling is Taylor expanded as a general function of the dark energy fraction $Ω_{\rm DE}$, i.e. $Ω^{\rm EFT}(a)=\sum_{i=0}^{n} c^{\rm EFT}_i Ω^i_{\rm DE}(a)$. Our findings constitute a detection of modified-gravity effects and call for a more flexible parametrization of the EFT functions than commonly used ones in literature. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_19898 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Non-minimally coupled gravity constraints from DESI DR2 data Pan, Jiaming Ye, Gen Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology It has been observed that the hint about dynamical dark energy in the DESI BAO observation might point to non-minimally coupled gravity. We report the first $3σ$ evidence for non-minimal coupling in a model-agnostic effective field theory (EFT) approach. In a non-parametric reconstruction approach, we detect a clear departure from the General Relativity expectation of non-minimal coupling based on a combined analysis of DESI DR2 BAO together with CMB and Type Ia supernova data. Also, it is found that current data can constrain up to the quadratic order $(n=2)$ if the EFT function representing non-minimal coupling is Taylor expanded as a general function of the dark energy fraction $Ω_{\rm DE}$, i.e. $Ω^{\rm EFT}(a)=\sum_{i=0}^{n} c^{\rm EFT}_i Ω^i_{\rm DE}(a)$. Our findings constitute a detection of modified-gravity effects and call for a more flexible parametrization of the EFT functions than commonly used ones in literature. |
| title | Non-minimally coupled gravity constraints from DESI DR2 data |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2503.19898 |