Testing Non-Coincident $f(Q)$-gravity with DESI DR2 BAO and GRBs
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| Format: | Preprint |
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2025
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| _version_ | 1866911300973494272 |
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| author | Paliathanasis, Andronikos |
| author_facet | Paliathanasis, Andronikos |
| contents | We consider the $f\left( Q\right) $-theory for the description of dark energy with a non-trivial connection defined in the non-coincident gauge. The resulting field equations form a two-scalar-field, quintom-like gravitational model. For the power-law model $f\left( Q\right) \simeq Q^{\frac{n}{n-1}}$, we construct an analytic expression for the dynamical evolution of dark energy, which depends on the parameter $n$. We constrain this dark energy model using the the baryon acoustic oscillations from DESI DR2, and gamma-ray bursts. The cosmological data provides $n\simeq0.33$. The $f\left( Q\right) $-model challenges the $Λ$CDM by providing a smaller value for $χ_{\min}^{2}$. Although the Akaike Information Criterion indicates that the two cosmological models fit the data from the Pantheon+, the cosmic chronometers and the baryonic acoustic oscillators in a similar way, when the gamma-ray bursts are introduced there is weak evidence in favor of the $f\left( Q\right) $-theory. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_11132 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Testing Non-Coincident $f(Q)$-gravity with DESI DR2 BAO and GRBs Paliathanasis, Andronikos General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics We consider the $f\left( Q\right) $-theory for the description of dark energy with a non-trivial connection defined in the non-coincident gauge. The resulting field equations form a two-scalar-field, quintom-like gravitational model. For the power-law model $f\left( Q\right) \simeq Q^{\frac{n}{n-1}}$, we construct an analytic expression for the dynamical evolution of dark energy, which depends on the parameter $n$. We constrain this dark energy model using the the baryon acoustic oscillations from DESI DR2, and gamma-ray bursts. The cosmological data provides $n\simeq0.33$. The $f\left( Q\right) $-model challenges the $Λ$CDM by providing a smaller value for $χ_{\min}^{2}$. Although the Akaike Information Criterion indicates that the two cosmological models fit the data from the Pantheon+, the cosmic chronometers and the baryonic acoustic oscillators in a similar way, when the gamma-ray bursts are introduced there is weak evidence in favor of the $f\left( Q\right) $-theory. |
| title | Testing Non-Coincident $f(Q)$-gravity with DESI DR2 BAO and GRBs |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2504.11132 |