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| Format: | Preprint |
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2026
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| Online Access: | https://arxiv.org/abs/2603.27428 |
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| _version_ | 1866915897342427136 |
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| author | Atayde, Luís Nunes, Simão Marques Frusciante, Noemi |
| author_facet | Atayde, Luís Nunes, Simão Marques Frusciante, Noemi |
| contents | We study a minimal modified gravity scenario in the symmetric teleparallel (non-metricity) formulation, focusing on an inverse non-metricity term with $f(Q)=Q+M^4 Q^{-1}$. The model does not introduce additional free parameters relative to $Λ$CDM, but modifies the late-time expansion and linear growth via an enhanced effective gravitational coupling. We identify key signatures: an enhanced matter power spectrum and CMB lensing, alongside a reduced late-time ISW effect and a shift in CMB peak positions. We confront the model with CMB data alone and in combination with BAO, RSD, SNIa, and DES large-scale structure data, considering both fixed minimal neutrino mass and varying $Σm_ν$. We find that the model typically prefers higher $H_0$ than $Λ$CDM, alleviating the $H_0$ tension, while its boosted growth tends to increase clustering amplitudes unless offset by larger neutrino masses when $Σm_ν$ is free. Overall, CMB-only data provide at most weak statistical support compared to $Λ$CDM, whereas late-time measurements impose tight restrictions that largely remove any improvement, positioning this model as a minimal yet strongly constrained alternative to dark energy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_27428 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Inverse non-metricity in $f(Q)$ gravity: cosmology and observational constraints Atayde, Luís Nunes, Simão Marques Frusciante, Noemi Cosmology and Nongalactic Astrophysics We study a minimal modified gravity scenario in the symmetric teleparallel (non-metricity) formulation, focusing on an inverse non-metricity term with $f(Q)=Q+M^4 Q^{-1}$. The model does not introduce additional free parameters relative to $Λ$CDM, but modifies the late-time expansion and linear growth via an enhanced effective gravitational coupling. We identify key signatures: an enhanced matter power spectrum and CMB lensing, alongside a reduced late-time ISW effect and a shift in CMB peak positions. We confront the model with CMB data alone and in combination with BAO, RSD, SNIa, and DES large-scale structure data, considering both fixed minimal neutrino mass and varying $Σm_ν$. We find that the model typically prefers higher $H_0$ than $Λ$CDM, alleviating the $H_0$ tension, while its boosted growth tends to increase clustering amplitudes unless offset by larger neutrino masses when $Σm_ν$ is free. Overall, CMB-only data provide at most weak statistical support compared to $Λ$CDM, whereas late-time measurements impose tight restrictions that largely remove any improvement, positioning this model as a minimal yet strongly constrained alternative to dark energy. |
| title | Inverse non-metricity in $f(Q)$ gravity: cosmology and observational constraints |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2603.27428 |