Observational Constraints of Modified Chaplygin Gas in Chern-Simons Gravity

Debnath, Ujjal

doi:10.1007/s10773-014-2195-5

Cited by 6 publications

(2 citation statements)

References 71 publications

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“…Park pointed out that additional terms like a −4 , a −2 contained in Friedmann equation in Horava-Lifshitz gravity can be responsible for cosmic acceleration [62]. Many other gravity theories like Chern-Simons gravity [63],…”

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

Self Cite

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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

Debnath

2021

Physics of the Dark Universe

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Observational Constraints of Modified Chaplygin Gas in Chern-Simons Gravity

Cited by 6 publications

References 71 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

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

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

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