Statefinder and Om Diagnostics for New Generalized Chaplygin Gas Model

Mamon, Abdulla Al; Dubey, Vipin Chandra; Bamba, Kazuharu

doi:10.3390/universe7100362

Cited by 12 publications

(7 citation statements)

References 73 publications

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“…After obtaining and normalizing the Hubble parameter for each model, we constrained the model parameters using the recent observational data OHD + SNeIa + BAO. We assumed the present density of the baryonic matter as Ω (b) 0 = 0.05 [74]. We started testing our cosmological solutions in section III and have obtained the best fit values of model parameters as listed in Table I.…”

Section: Discussionmentioning

confidence: 99%

Generalized Chaplygin gas and accelerating universe in $f(Q,T)$ gravity

Gadbail,

Arora,

Sahoo

2022

Preprint

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The generalized Chaplygin gas (GCG), which has an unusual perfect fluid equation of state, is another promising candidate for dark energy. We investigate the GCG scenario coupled with a baryonic matter in a newly suggested f (Q, T) gravity, an arbitrary function of non-metricity Q and the trace of energy-momentum tensor T. We consider the functional form of f (Q, T) as a linear combination of Q and an arbitrary function of T, denoted by h(T). Furthermore, we obtain two different functional forms of the f (Q, T) model under high pressure and high-density scenarios of GCG. We also test each model with the recent Pantheon supernovae data set of 1048 data points, Hubble data set of 31 points, and baryon acoustic oscillations. The deceleration parameter is constructed using OHD + SNeIa + BAO, predicting a transition from decelerated to accelerated phases of the universe expansion. Also, the equation of state parameter acquires a negative behavior depicting acceleration. Finally, we analyze the statefinder diagnostic to discriminate between the GCG and other dark energy models.

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Section: Discussionmentioning

confidence: 99%

Generalized Chaplygin gas and accelerating universe in $f(Q,T)$ gravity

Gadbail,

Arora,

Sahoo

2022

Preprint

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“…The NGCG model has been studied in previous work, such as [24,[64][65][66][67]. In the NGCG model, it assumes that the exotic background fluid interpolates between a dust-dominated epoch ρ ∼ a −3 and a cosmological constant-dominated epoch ρ ∼ a −3(1+ω) , which is portrayed as a unification of X-type dark energy and dark matter.…”

Section: Ngcg 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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“…According to the interpretation of the astrophysical findings, such dark energy fluid (assuming it is fluid) is distinguished by negative pressure, and its equation of state parameter ω is approaching −1 [19]. Mamon et al has discussed a unified model of dark matter and dark energy [20]. Numerous studies cover various areas related to f (R) gravity and accompanying cosmic dynamics.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of a parametrized dark energy model in $f(R,T)$ gravity

Singh,

Goswami

et al. 2022

Preprint

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We investigate a flat FLRW-model in f (R, T )-gravity, which includes the quadratic variation in scalar curvature R and the linear term of the trace of the stress-energy tensor T . In turn, we establish the model has the behaviour of the late time Universe, which is accelerated expanding and ends up in a big rip. Using the parametrization of scale factor a(t), we propose a model, which begins with point-type singularity, i.e., the model starts with a point of zero volume, infinite energy density and infinite temperature. The model's behaviour is accelerated expanding at present and ΛCDM in late times. Finally, the proposed model behaves like a quintessence dark energy model in the present time and is consistent with standard cosmology ΛCDM in late times.

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Statefinder and Om Diagnostics for New Generalized Chaplygin Gas Model

Cited by 12 publications

References 73 publications

Generalized Chaplygin gas and accelerating universe in $f(Q,T)$ gravity

Generalized Chaplygin gas and accelerating universe in $f(Q,T)$ gravity

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

Dynamics of a parametrized dark energy model in $f(R,T)$ gravity

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