Constraining the parameters of modified Chaplygin gas in Brans–Dicke theory

Debnath, Ujjal

doi:10.1016/j.dark.2020.100764

Cited by 10 publications

(3 citation statements)

References 78 publications

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“…The MCG model is also a unified dark matter and dark energy model, which is a modification of the GCG model. It has been widely discussed in many perspectives [58][59][60][61][62][63]. This class of equation of state is expressed as,…”

Section: Mcg Modelmentioning

confidence: 99%

Revisiting Chaplygin gas cosmologies with the recent observations of high-redshift quasars

et al. 2022

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In this paper, we use the latest observations of quasars covering the redshift range of $$0.04<z<5.1$$ 0.04 < z < 5.1 to investigate a series of Chaplygin gas models as candidates for unified dark matter and dark energy. Based on different combinations of available standard candle and standard ruler data, we put constraints on the generalized Chaplygin gas (GCG), modified Chaplygin gas (MCG), new generalized Chaplygin gas (NGCG) and viscous generalized Chaplygin gas (VGCG) models. Moreover, we apply Jensen–Shannon divergence (JSD), statefinder diagnostics, and the deviance information criterion (DIC) to distinguish these CG models, based on the statistical results derived from Markov chain Monte Carlo method. The results show that (1) The standard ruler data could provide more stringent constraints on the cosmological parameters of different CG models considered in this analysis. Interestingly, the matter density parameter $$\varOmega _{m}$$ Ω m and Hubble constant $$H_{0}$$ H 0 derived from the available data are well consistent with those from the Planck 2018 results; (2) Based on the statistical criteria JSD, our findings demonstrate the well consistency between Chaplygin gas and the concordance $$\varLambda $$ Λ CDM model. However, in the framework of statefinder diagnostics, the GCG and NGCG models cannot be distinguished from $$\varLambda $$ Λ CDM, while MCG and VGCG models show significant deviation from $$\varLambda $$ Λ CDM in the present epoch; (3) According to the the statistical criteria DIC, we show that the MCG and VGCG models have substantial observational support from high-redshift quasars, whereas the GCG and NGCG models miss out on the less observational support category but can not be ruled out.

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Section: Mcg Modelmentioning

confidence: 99%

Revisiting Chaplygin gas cosmologies with the recent observations of high-redshift quasars

et al. 2022

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“…Galileon gravity [64], Einstein-Aether gravity [65], Brans-Dicke theory [66], were combined with MCG to determine the observational constraints on the parameters. Motivated by this line of work, here we will review the observational constraints of MCJG and MCAG parameters with association of various f (T ) gravity models.…”

Section: Introductionmentioning

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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“…Also, the MCG parameters have been constrained by CMBR, WMAP data [56,57]. On the other hand, the MCG parameters have been constrained in modified gravity theories [58][59][60][61][62][63].…”

Section: Introductionmentioning

confidence: 99%

Roles of Modified Chaplygin-Jacobi and Chaplygin-Abel Gases in FRW Universe

Debnath

2021

Preprint

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We have considered flat Friedmann-Robertson-Walker (FRW) model of the universe and reviewed the modified Chaplygin gas as the fluid source. Associated with the scalar field model, we have determined the Hubble parameter as a generating function in terms of the scalar field. Instead of hyperbolic function, we have taken Jacobi elliptic function and Abel function in the generating function and obtained modified Chaplygin-Jacobi gas (MCJG) and modified Chaplygin-Abel gas (MCAG) equation of states, respectively. Next, we have assumed that the universe filled in dark matter, radiation, and dark energy. The sources of dark energy candidates are assumed as MCJG and MCAG. We have constrained the model parameters by recent observational data analysis. Using χ 2 minimum test (maximum likelihood estimation), we have determined the best fit values of the model parameters by OHD+CMB+BAO+SNIa joint data analysis. To examine the viability of the MCJG and MCAG models, we have determined the values of the deviations of information criteria like △AIC, △BIC and △DIC. The evolutions of cosmological and cosmographical parameters (like equation of state, deceleration, jerk, snap, lerk, statefinder, Om diagnostic) have been studied for our best fit values of model parameters. To check the classical stability of the models, we have examined the values of square speed of sound v 2 s in the interval (0, 1) for expansion of the universe.

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Constraining the parameters of modified Chaplygin gas in Brans–Dicke theory

Cited by 10 publications

References 78 publications

Revisiting Chaplygin gas cosmologies with the recent observations of high-redshift quasars

Revisiting Chaplygin gas cosmologies with the recent observations of high-redshift quasars

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

Roles of Modified Chaplygin-Jacobi and Chaplygin-Abel Gases in FRW Universe

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