dorsal/arxiv
View SchemaCosmological Dynamics on a Novel $f(Q)$ Gravity Model with Recent DESI DR2 Observation
| Authors | S. A. Kadam, D. Revanth Kumar, Santosh Kumar Yadav |
|---|---|
| Categories | |
| ArXiv ID | 2601.06438vv1 |
| URL | https://arxiv.org/abs/2601.06438 |
| License | http://creativecommons.org/licenses/by/4.0/ |
Abstract
In this article, we investigate the cosmological viability of a modified symmetric teleparallel gravity model within the $f(Q)$ framework. We derive observational constraints on the model parameters by performing a Markov Chain Monte Carlo analysis using a combined dataset consisting of cosmic chronometers, PantheonPlus SH0ES, and DESI BAO DR2. Our analysis yields the best-fit values for the model parameters $m=-0.386 \pm 0.090$ and $n=-1.055 \pm 0.047$, along with the cosmological parameters at present: $H_0 = 73.19 \pm 0.25$, $q_0 = -0.51 \pm 0.6$, and $\omega_{0} = -0.73 \pm 0.3$, at 68\% CL. Furthermore, we examine the physical behavior of the model, focusing on the effective equation of state and deceleration parameter. Our findings indicate that the model experiences a transition from the early deceleration phase to the late-time cosmic acceleration, and the transition occurs at a redshift $z_{tr} = 0.573$. We also analyse the $om(z)$ diagnostic, which reflects a positive slope, supporting the behavior of the equation of state parameter in the quintessence region.
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"abstract": "In this article, we investigate the cosmological viability of a modified symmetric teleparallel gravity model within the $f(Q)$ framework. We derive observational constraints on the model parameters by performing a Markov Chain Monte Carlo analysis using a combined dataset consisting of cosmic chronometers, PantheonPlus SH0ES, and DESI BAO DR2. Our analysis yields the best-fit values for the model parameters $m=-0.386 \\pm 0.090$ and $n=-1.055 \\pm 0.047$, along with the cosmological parameters at present: $H_0 = 73.19 \\pm 0.25$, $q_0 = -0.51 \\pm 0.6$, and $\\omega_{0} = -0.73 \\pm 0.3$, at 68\\% CL. Furthermore, we examine the physical behavior of the model, focusing on the effective equation of state and deceleration parameter. Our findings indicate that the model experiences a transition from the early deceleration phase to the late-time cosmic acceleration, and the transition occurs at a redshift $z_{tr} = 0.573$. We also analyse the $om(z)$ diagnostic, which reflects a positive slope, supporting the behavior of the equation of state parameter in the quintessence region.",
"arxiv_id": "2601.06438",
"authors": [
"S. A. Kadam",
"D. Revanth Kumar",
"Santosh Kumar Yadav"
],
"categories": [
"gr-qc",
"astro-ph.CO"
],
"license": "http://creativecommons.org/licenses/by/4.0/",
"title": "Cosmological Dynamics on a Novel $f(Q)$ Gravity Model with Recent DESI DR2 Observation",
"url": "https://arxiv.org/abs/2601.06438",
"version": "v1"
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