Dynamical study of viscous modified Chaplygin gas and confrontation with recent observational data

Mebarki, N.; Aberkane, D.

doi:10.1088/1742-6596/1258/1/012025

Cited by 2 publications

(1 citation statement)

References 31 publications

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“…Further along, the EoS was revised to derive other extensions like variable CG [21], variable modified CG [22], generalized cosmic Chaplygin gas (GCCG), the new variable modified Chaplygin gas (NVMCG) [23], viscous CG [24] etc. For better synchronization of the models to the observational data, constraints on different parameters of CG and MCG were investigated [25][26][27][28][29][30]. Using Jacobi's elliptic function, Villanueva formulated generalized Chaplygin-Jacobi gas correlated with the generalized Chaplygin scalar field [31][32][33] which can describe the inflationary stage and confronted the measurement recently released by the Planck 2015 data.…”

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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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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Constraining the parameters of generalized and viscous modified Chaplygin gas and black hole accretion in Einstein-Aether gravity

Mukherjee,

Debnath,

Chaudhary

et al. 2024

Eur. Phys. J. C

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In this paper, we investigate the phenomenon of the accelerated cosmic expansion in the late universe and the mass accretion process for a four-dimensional Einstein-Aether black hole. Starting with the basics of Einstein-Aether gravity theory, we first consider the field equations and two well-known models of Chaplygin gas, i.e., the generalized cosmic Chaplygin gas model and viscous modified Chaplygin gas model. We then obtain the energy density and Hubble parameter equations for these models in terms of various dimensionless density parameters and some unknown parameters. After finding the required parameters, we proceed with the mass accretion process. For both models, we obtain the equation of mass in terms of the redshift function and graphically represent the change in the mass of the black hole with a redshift. At the same time, we perform a graphical comparison between these models and the $$\Lambda $$ Λ CDM model of the universe. Finally, we conclude that the mass of a four-dimensional black hole will increase along the evolution of the universe within the framework of Einstein-Aether gravity.

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Dynamical study of viscous modified Chaplygin gas and confrontation with recent observational data

Cited by 2 publications

References 31 publications

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

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

Constraining the parameters of generalized and viscous modified Chaplygin gas and black hole accretion in Einstein-Aether gravity

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