The constrained accelerating universe in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si7.svg" display="inline" id="d1e4028"><mml:mrow><mml:mi>f</mml:mi><mml:mrow><mml:mo>(</mml:mo><mml:mi>R</mml:mi><mml:mo>,</mml:mo><mml:mi>T</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math> gravity

Singh, J.K.; Balhara, H.; Shaily,; Singh, P.

doi:10.1016/j.ascom.2024.100795

Astronomy and Computing

2024

DOI: 10.1016/j.ascom.2024.100795

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The constrained accelerating universe in f(R,T) gravity

J.K. Singh,

H. Balhara,

Shaily

et al.

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2024

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Cited by 3 publications

References 60 publications

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Dynamical analysis of a hyperbolic solution in scale-covariant theory

Shaily,

Singh,

Santos

et al. 2024

Int. J. Mod. Phys. D

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In this paper, we study an isotropic flat FLRW-model in scale-covariant theory of gravity [Formula: see text] 1 which is explained in terms of ordinary and covariant differentiation of scalar field [Formula: see text]. As we know, the deceleration parameter (DP) is time-dependent, so we consider the DP q as the function of t. Using this methodology, we find all the important cosmological factors in terms of a hyperbolic function of the cosmic time t. In turn, we create the model having the behavior of the late-time universe, which is ever accelerated expanding and faces a Big Freeze at the end. The model shows the quintessence dark energy model from early to late times. We compute the constrained values of Hubble parameter [Formula: see text] and the model parameter [Formula: see text] using joint analysis of the OHD data of 77-points and Pantheon bin data. The model exhibits point-type singularity as it begins with a point of zero volume, infinite energy density and temperature. Furthermore, we obtain the present value of DP [Formula: see text]. Also, we examine the ultimate behavior of our model by the proper analysis of energy conditions (ECs), cosmographical parameters and Statefinder diagnostic. Finally, the proposed model behaves like a quintessence dark energy model.

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Dynamical analysis of a hyperbolic solution in scale-covariant theory

Shaily,

Singh,

Santos

et al. 2024

Int. J. Mod. Phys. D

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Observational Constraints and Cosmographic Analysis of f(T,TG) Gravity and Cosmology

Balhara,

Singh,

Shaily

et al. 2024

Symmetry

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We perform observational confrontation and cosmographic analysis of f(T,TG) gravity and cosmology. This higher-order torsional gravity is based on both the torsion scalar, as well as on the teleparallel equivalent of the Gauss–Bonnet combination, and gives rise to an effective dark-energy sector which depends on the extra torsion contributions. We employ observational data from the Hubble function and supernova Type Ia Pantheon datasets, applying a Markov chain Monte Carlo sampling technique, and we provide the iso-likelihood contours, as well as the best-fit values for the parameters of the power-law model, an ansatz which is expected to be a good approximation of most realistic deviations from general relativity. Additionally, we reconstruct the effective dark-energy equation-of-state parameter, which exhibits a quintessence-like behavior, while in the future the Universe enters into the phantom regime, before it tends asymptotically to the cosmological constant value. Furthermore, we perform a detailed cosmographic analysis, examining the deceleration, jerk, snap, and lerk parameters, showing that the transition to acceleration occurs in the redshift range 0.52≤ztr≤0.89, as well as the preference of the scenario for quintessence-like behavior. Finally, we apply the Om diagnostic analysis to cross-verify the behavior of the obtained model.

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New Parametrization of the Dark-Energy Equation of State with a Single Parameter

Singh,

Saridakis

et al. 2024

Universe

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We propose a novel dark-energy equation-of-state parametrization, with a single parameter η that quantifies the deviation from ΛCDM cosmology. We first confront the scenario with various datasets, from the Hubble function (OHD), Pantheon, baryon acoustic oscillations (BAO), and their joint observations, and we show that η has a preference for a non-zero value, namely, a deviation from ΛCDM cosmology is favored, although the zero value is marginally inside the 1σ confidence level. However, we find that the present Hubble function value acquires a higher value, namely, H0=66.624−0.013+0.011 Km s−1 Mpc−1, which implies that the H0 tension can be partially alleviated. Additionally, we perform a cosmographic analysis, showing that the universe transits from deceleration to acceleration in the recent cosmological past; nevertheless, in the future, it will not result in a de Sitter phase since it exhibits a second transition from acceleration to deceleration. Finally, we perform the statefinder analysis. The scenario behaves similarly to the ΛCDM paradigm at high redshifts, while the deviation becomes significant at late and recent times and especially in the future.

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The constrained accelerating universe in f(R,T) gravity

Cited by 3 publications

References 60 publications

Dynamical analysis of a hyperbolic solution in scale-covariant theory

Dynamical analysis of a hyperbolic solution in scale-covariant theory

Observational Constraints and Cosmographic Analysis of f(T,TG) Gravity and Cosmology

New Parametrization of the Dark-Energy Equation of State with a Single Parameter

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