Dust matter cosmology in modified symmetric teleparallel $f(Q,T)$ gravity

Abstract

We investigate the nonlinear $f(Q,T)$ gravity model, $f(Q,T)=\alpha Q^n+\beta T+\gamma$, which represents a nontrivial coupling between geometry and matter in the context of a dust-dominated Universe. The model parameters $(H_0,\alpha ,\beta ,\gamma ,n)$ are constrained using recent cosmological observations, including Hubble parameter measurements $H(z)$, the Pantheon+SH0ES dataset, and DESI BAO data. The analysis shows that the Hubble constant exhibits dataset-dependent variations, reflecting the persisting Hubble tension, while $\alpha$ and $\gamma$ are tightly constrained and $\beta$ remains weakly determined. The nonlinear exponent $n$ introduces an additional degree of freedom that enhances the model's flexibility in reproducing observational trends. The cosmographic diagnostics, including the deceleration, jerk, snap, and lerk parameters, indicate a Universe transitioning from early deceleration to late-time acceleration, with present values closely aligned with $\Lambda$CDM predictions and far-future behavior approaching a de Sitter phase. These results demonstrate that the nonlinear $f(Q,T)$ model provides a simple and viable framework to describe late-time cosmic acceleration, accommodate observational tensions, and reproduce $\Lambda$CDM-like dynamics with subtle deviations.

arXiv commentPhysics of the Dark Universe published version

References in corpus (48)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• emcee: The MCMC Hammer
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• Detection of the Baryon Acoustic Peak in the Large-Scale Correlation Function of SDSS Luminous Red Galaxies
• Type Ia Supernova Discoveries at z>1 From the Hubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution
• Cosmological Imprint of an Energy Component with General Equation of State
• A Phantom Menace? Cosmological consequences of a dark energy component with super-negative equation of state
• The Pantheon+ Analysis: Cosmological Constraints
• Dark Energy Constraints from the Cosmic Age and Supernova
• A 6% measurement of the Hubble parameter at $z\sim 0.45$: direct evidence of the epoch of cosmic re-acceleration
• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
• Raising the bar: new constraints on the Hubble parameter with cosmic chronometers at z$\sim$2
• Improved constraints on the expansion rate of the Universe up to z~1.1 from the spectroscopic evolution of cosmic chronometers
• Coincident General Relativity
• The Pantheon+ Analysis: The Full Dataset and Light-Curve Release
• Jerk, snap, and the cosmological equation of state
• $f(Q,T)$ gravity
• Large Scale Structure as a Probe of Gravitational Slip
• Setting the Stage for Cosmic Chronometers. II. Impact of Stellar Population Synthesis Models Systematics and Full Covariance Matrix
• DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman Alpha Forest
• Dark matter as a geometric effect in f(R) gravity
• Nonminimal torsion-matter coupling extension of f(T) gravity
• Dos and don'ts of reduced chi-squared
• Symmetric teleparallel general relativity
• Lagrange formulation of the symmetric teleparallel gravity
• Weyl type $f(Q,T)$ gravity, and its cosmological implications
• Anthropic Principle Favors the Holographic Dark Energy
• A parametric reconstruction of the deceleration parameter
• Anisotropic nature of space-time in $f(Q)$ gravity
• Three thermodynamically-based parametrizations of the deceleration parameter
• Using Pantheon and DES supernova, baryon acoustic oscillation, and Hubble parameter data to constrain the Hubble constant, dark energy dynamics, and spatial curvature
• Astronomical bounds on a cosmological model allowing a general interaction in the dark sector
• Matter Bounce Scenario and the Dynamical aspects in f(Q,T) Gravity
• Cosmic acceleration and energy conditions in $\Lambda$CDM symmetric teleparallel $f(Q)$ gravity
• Geodesic deviation, Raychaudhuri equation, Newtonian limit, and tidal forces in Weyl-type $f(Q,T)$ gravity
• Late-time acceleration in $f\left(Q\right)$ gravity: Analysis and constraints in an anisotropic background
• A new parametrization of Hubble parameter in $f(Q)$ gravity
• Constraints on barotropic dark energy models by a new phenomenological $q(z)$ parameterization
• Non-parametric reconstruction of the cosmological \textit{jerk} parameter
• Constant sound speed and its thermodynamical interpretation in $f(Q)$ gravity
• Observational constraints of a new unified dark fluid and the $H_0$ tension
• Quintessence Universe and cosmic acceleration in $f(Q,T)$ gravity
• Anisotropic Universe in $f(Q,T)$ gravity, a novel study
• Bouncing cosmologies and stability analysis in symmetric teleparallel $f(Q)$ gravity
• Anisotropic f(Q) gravity model with bulk viscosity
• From Hubble to Snap Parameters: A Gaussian Process Reconstruction