Testing Non-Coincident $f(Q)$-gravity with DESI DR2 BAO and GRBs

Abstract

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 $n\simeq 0.33$. The $f\left(Q\right)$-model challenges the $\Lambda$CDM by providing a smaller value for ${\chi }_{\min }^2$. 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.

8 pages, 4 figures, version accepted for publication in Physics of the Dark Universe

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Cited by in corpus (14)

• Quintessence and phantoms in light of DESI 2025
• Reconstructing dark energy with model independent methods after DESI DR2 BAO
• Barrow and Tsallis entropies after the DESI DR2 BAO data
• Challenging $\Lambda$CDM with Higher-Order GUP Corrections
• A generic dynamical system formulation for Bianchi-I cosmology with isotropic fluid in $f(Q)$ gravity
• Addressing the $H_0$ tension through matter with pressure and no early dark energy
• Accelerating behavior from dynamical system analysis parameters
• Updated Cosmological Constraints from 2D BAO Measurements: A New Compilation and Comparison with DESI DR2
• Modified cosmology through generalized mass-to-horizon entropy: observational constraints from DESI DR2 BAO data
• Viability of general relativity and modified gravity cosmologies using high-redshift cosmic probes
• A Unified Dynamical Systems Framework for Cosmology in $f(Q)$ Gravity: Generic Features Beyond the Coincident Gauge
• Gamma-Ray Bursts Calibrated by Using Artificial Neural Networks from the Pantheon+ Sample
• Observational constraints on the modified cosmology inspired by string T-duality
• Insights in $f(Q)$ cosmology: the relevance of the connection