Viscous generalised Chaplygin gas under the purview of f(T) gravity and the model assessment through probabilistic information theory

Saha, Sanghati; Chattopadhyay, Surajit

doi:10.1088/1402-4896/ac5af4

Cited by 6 publications

(4 citation statements)

References 116 publications

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“…While concluding, let us mention the newness of the current work with respect to some related works. First, let us mention the work by us in [161] where generalized Chaplygin Gas was studied in a f (T) gravity framework and the Shannon entropy approach was adopted to optimize the uncertainty associated with the model. Contrary to [161], the current work is extended much further by focusing on the realization of cosmological bounce in a reconstruction scheme for modified gravity with modified generalized Chaplygin Gas as the background fluid.…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

“…First, let us mention the work by us in [161] where generalized Chaplygin Gas was studied in a f (T) gravity framework and the Shannon entropy approach was adopted to optimize the uncertainty associated with the model. Contrary to [161], the current work is extended much further by focusing on the realization of cosmological bounce in a reconstruction scheme for modified gravity with modified generalized Chaplygin Gas as the background fluid. In this context, another relevant work by one of the authors of the current paper, namely "A study on the bouncing behavior of modified Chaplygin Gas in presence of bulk viscosity and its consequences in the modified gravity framework" where modified Chaplygin Gas is studied in f (T) gravity for non-singular bounce, concentrating on the suitability of the bouncing scale factor in inflationary cosmology as well.…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

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Realization of Bounce in a Modified Gravity Framework and Information Theoretic Approach to the Bouncing Point

Saha

Chattopadhyay

2023

Universe

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In this work, we report a study on bouncing cosmology with modified generalized Chaplygin Gas (mgCG) in a bulk viscosity framework. Reconstruction schemes were demonstrated in Einstein and modified f(T) gravity framework under the purview of viscous cosmological settings. We also took non-viscous cases into account. We studied the equation of state (EoS) parameter under various circumstances and judged the stability of the models through the sign of the squared speed of sound. We observed the mgCG behaving like avoidance of Big Rip in the presence of bulk viscosity at the turnaround point and in non-viscous cases, a phantom-like behavior appears. The turnaround point equation of state parameter crosses the phantom boundary, violating NEC. The role of the mgCG’s model parameters was also investigated before and after the bounce. A Hubble flow dynamics was carried out and, it was revealed that mgCG is capable of realizing an inflationary phase as well as an exit from inflation. An f(T) gravitational paradigm was also considered, where the mgCG density was reconstructed in the presence of bulk viscosity. The role of the parameters associated with the bouncing scale factor, describing how fast the bounce takes place, was also studied in this framework. Finally, the reconstructed mgCG turned out to be stable against small perturbations irrespective of the presence of bulk viscosity and modified gravity scenario. Finally, the reconstruction scheme was assessed using statistical analysis, Shannon entropy.

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Section: Discussion and Concluding Remarksmentioning

confidence: 99%

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

Realization of Bounce in a Modified Gravity Framework and Information Theoretic Approach to the Bouncing Point

Saha

Chattopadhyay

2023

Universe

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“…The title of the paper itself reflects that the torsion contribution is considered due to the density ρ T to evolve in the form of some Chaplygin gas (Saha & Chattopadhyay 2022). We would now like to discuss some features of the modified theory of gravity (Nojiri & Odintsov 2007, 2011bNojiri et al 2017Nojiri et al , 2018 which is an alternative explanation for late time acceleration of the universe, with more emphasis on f (T) gravity.…”

Section: Introductionmentioning

confidence: 99%

Cosmology of a Chaplygin Gas Model Under f(T) Gravity and Evolution of Primordial Perturbations

Sultana

Chattopadhyay

2023

Res. Astron. Astrophys.

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This paper reports a detailed study of generalized Chaplygin gas (GCG) with power law form of scale factor and truncated form of the scale factor using binomial expansion in both interacting and non-interacting scenario and along with that its cosmological consequences is studied on equation of state (EoS) parameter. In the non-interacting scenario, the EoS parameter behaves as quintessence in both the form of the scale factor. In the interacting scenario, the EoS parameter behaves as phantom and for the truncated form of the scale factor, it is violating the constraints of the positive parameter $\alpha$. The cosmological implementation of GCG interacting with pressureless dark matter (DM) is investigated in the framework of $f(T)$ modified gravity, where $T$ is the torsion scalar in teleparallelism. The interaction term is directly proportional to the GCG density with positive coupling constant. In $f(T)$ gravity, the EoS is behaving like phantom. The stability of the reconstructed model is investigated and it is found stable against small gravitational perturbations i.e., the squared speed of sound is non-negative and an increasing function of cosmic time $t$. We have observed that our reconstructed $f(T)$ model satisfies one of the sufficient conditions ofa realistic reconstructed model and it is consistent with the CMB constraints and the primordial nucleosynthesis. Cosmology of primordial perturbations has also been analysed and the self-interacting potential has been found as an increasing function of cosmic time $t$.

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“…[44][45][46], the authors have analyzed the cosmology in f (T ) gravity where the universe is filled with a single viscous fluid by considering specific evolutionary functions given by H (t) ∝ 1/t λ , where H is the Hubble parameter, t is the cosmic time and λ is a constant parameter. Moreover, f (T ) gravity has also been used to reconstruct the generalized Chaplygin gas model with viscosity [49]. In the current work, to accommodate some of the existing late time viscous models, we propose a simple unifying bulk viscous model of the matters that can be applied to different epochs of the universe.…”

Section: Introductionmentioning

confidence: 99%

Viscous cosmology in f(T) gravity

2022

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We propose a new model for the viscosity of cosmic matters, which can be applied to different epochs of the universe. Using this model, we include the bulk viscosities as practical corrections to the perfect fluid models of the baryonic and dark matters since the material fluids in the real world may have viscosities due to thermodynamics. Such inclusion is put to the test within the framework of f(T) gravity that is proved to be successful in describing the cosmic acceleration, where T denotes the torsion scalar. We perform an observational fit to our model and constrain the cosmological and model parameters by using various latest cosmological datasets. Based on the fitting result, we discuss several cosmological implications including the dissipation of matters, the evolutionary history of the universe, f(T) modification as an effective dark energy, and the Hubble tension problem. The corresponding findings are (i) The late time dissipation will make the density parameters of the matters vanish in the finite future. Moreover, the density ratio between the baryonic and dark matters will change over time. (ii) The radiation dominating era, matter dominating era and the accelerating era can be recovered and the model can successfully describe the known history of the universe. (iii) The f(T) modification is the main drive of the acceleration expansion and currently mimics a phantom-like dark energy. But the universe will eventually enter a de Sitter expansion phase. (iv) The Hubble tension between local and global observations can be significantly alleviated in our model.

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Viscous generalised Chaplygin gas under the purview of f(T) gravity and the model assessment through probabilistic information theory

Cited by 6 publications

References 116 publications

Realization of Bounce in a Modified Gravity Framework and Information Theoretic Approach to the Bouncing Point

Realization of Bounce in a Modified Gravity Framework and Information Theoretic Approach to the Bouncing Point

Cosmology of a Chaplygin Gas Model Under f(T) Gravity and Evolution of Primordial Perturbations

Viscous cosmology in f(T) gravity

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