Observational Constraining Study of New Deceleration Parameters in FRW Universe

Bouali, Amine; Chaudhary, Himanshu; Mumtaz, Saadia; Mustafa, G.; Maurya, S. K.

doi:10.1002/prop.202300033

Cited by 11 publications

(2 citation statements)

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“…Studying the deceleration parameter is essential for understanding the evolution of the Universe and the influence of different components such as matter, radiation, or dark energy on its expansion dynamics. References such as [101][102][103][104][105] have employed the deceleration parameter to analyze and explain the evolutionary phases of the Universe in different cosmological models.…”

Section: Deceleration Parametermentioning

confidence: 99%

Constraints on the parameters of modified Chaplygin-Jacobi and modified Chaplygin-Abel gases in f(T) gravity

Chaudhary,

Debnath,

Roy

et al. 2023

Preprint

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In this work, we explore the parameter constraints of two dark energy models, namely the Modified Chaplygin-Jacobi gas (MCJG) and Modified Chaplygin-Abel gas (MCAG), within the context of $f(T)$ gravity model in a non-flat Friedmann-Lema\^itre-Robertson-Walker (FLRW) Universe. Our investigation involves comparing the equation of state for the MCJG and MCAG dark energy models with the equation of state derived from the $f(T)$ gravity model. To derive constraints for the dark energy and $f(T)$ gravity models, we use recent astronomical datasets, including $H(z)$ data, type Ia supernovae observations, Gamma Ray Bursts data, quasar data, and Baryon Acoustic Oscillation (BAO) measurements. We present the reduced Hubble parameter in terms of observable parameters such as $\Omega_{r0}$ (density parameter of radiation), $\Omega_{m0}$ (density parameter of dark matter), $\Omega_{k0}$ (density parameter associated with spatial curvature), $\Omega_{CJ0}$ (density parameter of Modified Chaplygin-Jacobi gas), $\Omega_{CA0}$ (density parameter of Modified Chaplygin-Abel gas), and $H_0$ (present value of the Hubble parameter). We explore the cosmological evolution through various cosmic diagnostic parameters, including the deceleration parameter, $Om(z)$ diagnostic, and statefinder diagnostic pair $\{r,s\}$. These diagnostic parameters offer valuable insights into the expansion dynamics and the nature of dark energy in the Universe. We have also assessed the viability of the models using the information criteria. Our aim is to shed light on the nature of dark energy and its connection to the $f(T)$ gravity model, and ultimately gain a deeper understanding of the underlying mechanisms driving the accelerated expansion of our Universe.

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Section: Deceleration Parametermentioning

confidence: 99%

Constraints on the parameters of modified Chaplygin-Jacobi and modified Chaplygin-Abel gases in f(T) gravity

Chaudhary,

Debnath,

Roy

et al. 2023

Preprint

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“…Recently, several theoretical models have been developed to analyze the entire evolutionary history of the Universe through parameterization of q(z) as a function of scale factor (a(t)) or time (t) or redshift (z) in the reference. [36][37][38][39][40][41][42][43][44] The following is how this document is organized. In the introduction part, models in modern cosmology are discussed.…”

Section: Introductionmentioning

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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