Dynamical features of an anisotropic cosmological model

Mishra, B.; Tarai, Sankarsan; Tripathy, S. K.

doi:10.1007/s12648-018-1194-4

Cited by 31 publications

(19 citation statements)

References 49 publications

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“…Case-I: Little Rip: For the LR model in equation (38),Ḣ = λH 0 e λt , we obtain from equation (37) ρ + p = − 2λH 0 e λt κ T + 2β (73) Substituting (73) into (72), we get the wormhole throat radius for the LR case as…”

Section: Wormhole Solutions and Big Tripmentioning

confidence: 99%

Phantom cosmology in an extended theory of gravity

Tripathy

Mishra

2020

Chinese Journal of Physics

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Some phantom cosmological models without big rip singularity have been constructed in a simple extended theory of gravity. In the geometrical part of the action, a minimally coupled linear function of the Ricci Scalar and the trace of the energy momentum tensor have been considered in place of the Ricci scalar. Four Little Rip and Pseudo Rip models have been investigated where the equation of state parameter evolves asymptotically and sufficiently rapidly to −1. The effect of the coupling constant of the extended gravity theory on the dynamics has been discussed. Possible wormhole solutions for the phantom models are obtained. The possibility of Big Trip in wormholes are discussed for the models.PACS number: 04.50kd.

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Section: Wormhole Solutions and Big Tripmentioning

confidence: 99%

Phantom cosmology in an extended theory of gravity

Tripathy

Mishra

2020

Chinese Journal of Physics

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“…The dynamical synthesis of the model can be determined through the physical quantities given in eqns. (15)- (17). The formalism developed for the dynamical parameters (15)- (17) can help us to analyse the background cosmology for an assumed dynamics of the universe.…”

Section: Solution With Hybrid Scale Factormentioning

confidence: 99%

“…(15)- (17). The formalism developed for the dynamical parameters (15)- (17) can help us to analyse the background cosmology for an assumed dynamics of the universe. Therefore, in this work, we have considered the hybrid scale factor (HSF), where the cosmic expansion is governed through a scale factor of the form R = e at t b , where a and b are positive constant and it assumed 0 < [a, b] < 1.…”

Section: Solution With Hybrid Scale Factormentioning

confidence: 99%

Behaviour of the cosmological model with variable deceleration parameter

2016

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In this paper, we have derived the field equations in an extended theory of gravity in an anisotropic space time background and in the presence of magnetic field. The physical and geometrical parameters of the models are determined with respect to the Hubble parameter using some algebraic approaches. A time varying scale factor has been introduced to analyze the behavior of the model. From some diagnostic approach, we found that the model behaves as ΛCDM model at late time of cosmic evolution.PACS number: 04.50kd.

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“…The anisotropic and dynamical issues in f ( R , T ) gravity have been discussed in details. [ 28–30 ] Saridakis et al. [ 31 ] have investigated the cosmological applications of f ( R , T ) gravity.…”

Section: Introductionmentioning

confidence: 99%

Cosmological Models with Big Rip and Pseudo Rip Scenarios in Extended Theory of Gravity

Ray¹,

Tarai

Mishra

et al. 2021

Fortschritte der Physik

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In this paper, we have presented the big rip and pseudo rip cosmological models in an extended theory of gravity. The matter field is considered to be that of perfect fluid. The geometrical parameters are adjusted in such a manner that it matches the prescriptions given by cosmological observations, to be specific to the H0 range. The models favour phantom behaviour. The violation of strong energy conditions are shown in both the models, as it has become essential in an extended gravity theory to provide late time cosmic acceleration. We show that, the choice of the coupling parameter has significant effects on the evolution of the universe.

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Dynamical features of an anisotropic cosmological model

Cited by 31 publications

References 49 publications

Phantom cosmology in an extended theory of gravity

Phantom cosmology in an extended theory of gravity

Behaviour of the cosmological model with variable deceleration parameter

Cosmological Models with Big Rip and Pseudo Rip Scenarios in Extended Theory of Gravity

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