An accelerating cosmological model from a parametrization of Hubble parameter

Pacif, S. K. J.; Khan, S.; Paikroy, L. K.; Singh, S. Surendra

doi:10.1142/s021773232050011x

Cited by 27 publications

(5 citation statements)

References 52 publications

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“…From this equation, we observe that the value of r depends on the parameters α, βand c 1 , as well as the redshift z. By analyzing the behavior of r with respect to z, we gain insights into the properties of the cosmological model under consideration which is shown in the 2D and 3D plot of figure (15). Based on our observation, we find that the parameter r increases gradually as redshift z increases.…”

Section: State Finder Diagnosticmentioning

confidence: 64%

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Two Fluids in f(T) Gravity with Observational Constraints

Pawar,

Gaikwad,

Ghungarwar

2023

Preprint

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In this study, we have examined the behavior of two fluids within the framework of $f(T)$ gravity, while taking into account observational constraints. Our focus was specifically on the Locally Rotationally Symmetric Bianchi-I Universe in the context of $f(T)$ theory of gravity. By investigating the evolution of the universe, we utilized various cosmological parameters, such as the deceleration parameter, equation of state parameter, density parameter, pressureand statefinder diagnostics. Additionally, we analyzed the geometric properties of the model. In the teleparallel theories, we derived the torsion scalar T from the given metric's torsion tensor.

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Section: State Finder Diagnosticmentioning

confidence: 64%

“…Overall, the study of modified theories of gravity, including f (T ) and f (Q) theories, provides an intriguing avenue to explore alternative explanations for the acceleration of the Universe and addresses the quest for a consistent theory of quantum gravity. Pacif 15…”

Section: Introductionmentioning

confidence: 99%

Two Fluids in f(T) Gravity with Observational Constraints

Pawar,

Gaikwad,

Ghungarwar

2023

Preprint

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“…There are a few intriguing models of dark energy and modified gravity based on various parameterization schemes of some geometrical parameters. [ 56–60 ] This discussion motivates us to consider a specific form of Hubble parameter. The goal of this paper is to find an exact solution to the EFE in conventional GR theory using a simple parameterization of the Hubble parameter

H(t)

and reconstruct the cosmic evolution.…”

Section: Solution Of Field Equations In a Model‐independent Waymentioning

confidence: 99%

Model‐Independent Study for a Quintessence Model of Dark Energy: Analysis and Observational Constraints

Bouali,

Chaudhary,

Mehrotra

et al. 2023

Fortschritte der Physik

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In this paper, a well‐motivated parameterization of the Hubble parameter (H) is revisited that renders two models of dark energy showing some intriguing features of the late‐time accelerating Universe. A general quintessence field is considered as a source of dark energy. Tighter constraints using recently updated cosmic observational datasets for the considered models have been obtained. The two models described here show a nice fit to the considered uncorrelated Hubble datasets, Standard candles, Gamma Ray Bursts, Quasars, and uncorrelated Baryonic Acoustic Oscillations datasets. Using the constrained values of the model parameters, some features of the late‐time accelerating models and obtained the present value of the deceleration parameter (q0), the present value of the Hubble parameter (H0) and the transition redshift () from deceleration to acceleration have been discussed. The current value of the deceleration parameter for both models is consistent with the Planck 2018 results. The evolution of the geometrical and physical parameters is discussed through graphical representations for both models with some diagnostic analysis. The statistical analysis performed here shows greater results and overall, the outcomes of this investigation are superior to those previously found.

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“…This is one of the reasons why we chose to parametrize H(z), as all other cosmological parameters are directly related to it. Till now a number of parametric forms of Hubble parameter have been proposed (see [37][38][39] and the references therein) in the context of quintessence scalar field models of DE.…”

Section: Introductionmentioning

confidence: 99%

Quintessence or Phantom: Study of scalar field dark energy models through a general parametrization of the Hubble parameter

Roy¹,

Goswami²,

Das³

2022

Preprint

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In this work we propose a simple general parametrization scheme of the Hubble parameter for the scalar field dark energy models. In our approach it is possible to incorporate both the quintessence and phantom scalar field in a single analytical scheme and write down relevant cosmological parameters which are independent of the nature of the scalar field. A general condition for the phantom barrier crossing has also been obtained. To test this approach, a well behaved parametrization of the normalized Hubble parameter has been considered and a wide variety of observational data like CMB data, Supernovae data, BAO data etc. has been used to constraint the various cosmological parameters. It has been found that data prefer the present value of the equation of state of the dark energy to be in the phantom domain. One interesting outcome of this analysis is that although the current value of the dark energy equation of state is phantom in nature, a phantom crossing of the EOS has taken place in the recent past. We have also carried out the Bayesian model comparison between ΛCDM model and the proposed model which indicates that this model is favored by data as compared to ΛCDM model.

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An accelerating cosmological model from a parametrization of Hubble parameter

Cited by 27 publications

References 52 publications

Two Fluids in f(T) Gravity with Observational Constraints

Two Fluids in f(T) Gravity with Observational Constraints

Model‐Independent Study for a Quintessence Model of Dark Energy: Analysis and Observational Constraints

Quintessence or Phantom: Study of scalar field dark energy models through a general parametrization of the Hubble parameter

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