Plane symmetric model in f(R, T) gravity

Singh, Vijay; Беешам, Ароонкумар

doi:10.1140/epjp/s13360-020-00314-x

Cited by 21 publications

(15 citation statements)

References 80 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If the FRW universe is undergoing a 'bounce' then it attains a minimum and at this minimum, the strong energy condition (SEC) of classical gravity must be violated (which is necessary but not the sufficient condition) [34]. In a bouncing universe, the universe first undergoes a collapse to attains a minimum and then subsequently expands.…”

Section: Main Equations In Frw Universe and Bounce Conditionsmentioning

confidence: 99%

See 1 more Smart Citation

Bouncing universe in the contexts of generalized cosmic Chaplygin gas and variable modified Chaplygin gas

Bandyopadhyay

Debnath

2019

Can. J. Phys.

View full text Add to dashboard Cite

In this work, we have considered the Friedmann-Robertson-Walker (FRW) model of the universe where bounce occurs and the universe is filled with Generalized Cosmic Chaplygin Gas (GCCG) or Variable Modified Chaplygin Gas (VMCG). We have studied the stability analysis through dynamical system for both models and found the critical points in flat, open and closed universe. In presence of scalar field, the dynamical behavior of scale factor and Hubble parameter is described in both models. Finally, we have analyzed the energy conditions for both the models in bouncing universe.

show abstract

Section: Main Equations In Frw Universe and Bounce Conditionsmentioning

confidence: 99%

“…On the other hand, the bouncing cosmology has also been studied in the framework of some modified theories of gravity eg. f (R) gravity [23][24][25][26][27][28][29], f (T ) gravity [30,31], Gauss-Bonnet gravity [32,33], Brans-Dicke theory [34], braneworld gravity [35][36][37][38] and loop quantum cosmology [39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Bouncing universe in the contexts of generalized cosmic Chaplygin gas and variable modified Chaplygin gas

Bandyopadhyay

Debnath

2019

Can. J. Phys.

View full text Add to dashboard Cite

show abstract

“…In particular, the Locally-Rotationally-Symmetric (LRS) B-I spacetime is one of the simplified versions of the B-I model. In light of its importance, many researchers have studied the LRS B-I models in various contexts (see [8][9][10][11][12] and references therein).…”

Section: Introductionmentioning

confidence: 99%

“…The modified theories of gravity include higher derivative theories, Gauss-Bonnet f (G) gravity, f (R) theory, f (T ) and f (R, T ) gravity theories. In the past decade, f (R, T ) gravity has attracted the attention of many researchers to look at many astrophysical and cosmological phenomena in the context of this theory (see [11] for a broad list of references).…”

Section: Introductionmentioning

confidence: 99%

LRS Bianchi I model with bulk viscosity in f(R,T) gravity

Jokweni,

Singh,

Beesham

2021

Preprint

Self Cite

View full text Add to dashboard Cite

Locally-rotationally-symmetric Bianchi type-I viscous and nonviscous cosmological models are explored in general relativity (GR) and in f (R, T ) gravity. Solutions are obtained by assuming that the expansion scalar is proportional to the shear scalar which yields a constant value for the deceleration parameter (q = 2). Constraints are obtained by requiring the physical viability of the solutions. A comparison is made between the viscous and non-viscous models, and between the models in GR and in f (R, T ) gravity. The metric potentials remain the same in GR and in f (R, T ) gravity. Consequently, the geometrical behavior of the f (R, T ) gravity models remains the same as the models in GR. It is found that f (R, T ) gravity or bulk viscosity does not affect the behavior of effective matter which acts as a stiff fluid in all models. The individual fluids have very rich behavior. In one of the viscous models, the matter either follows a semi-realistic EoS or exhibits a transition from stiff matter to phantom, depending on the values of the parameter. In another model, the matter describes radiation, dust, quintessence, phantom, and the cosmological constant for different values of the parameter. In general, f (R, T ) gravity diminishes the effect of bulk viscosity.

show abstract

“…One may ensure a physically viable scenario by demanding the weak energy condition (WEC) 1 for the primary matter and coupled matter. We have followed this criteria in our recent study Singh and Beesham (2020). We shall follow this criteria in present work too.…”

mentioning

confidence: 97%

LRS Bianchi I model with constant expansion rate in $f(R,T)$ gravity

Singh,

Beesham

2020

Preprint

Self Cite

View full text Add to dashboard Cite

An LRS Bianchi-I space-time model is studied with constant Hubble parameter in f (R, T ) = R + 2λT gravity. Although a single (primary) matter source is considered, an additional matter appears due to the coupling between matter and f (R, T ) gravity. The constraints are obtained for a realistic cosmological scenario, i.e., one obeying the null and weak energy conditions. The solutions are also extended to the case of a scalar field (normal or phantom) model, and it is found that the model is consistent with a phantom scalar field only. The coupled matter also acts as phantom matter.The study shows that if one expects an accelerating universe from an anisotropic model, then the solutions become physically relevant only at late times when the universe enters into an accelerated phase. Placing some observational bounds on the present equation of state of dark energy, ω 0 , the behavior of ω(z) is depicted, which shows that the phantom field has started dominating very recently, somewhere between 0.2 z 0.5. IntroductionHarko et al. ( 2011) proposed a general non-minimal coupling between matter and geometry in the framework of an effective gravitational Lagrangian consisting of an arbitrary function of the Ricci scalar R, and the trace T of the energy-momentum tensor, and introduced f (R, T ) gravitational theory. An extra acceleration in f (R, T ) gravity results not only

show abstract

Plane symmetric model in f(R, T) gravity

Cited by 21 publications

References 80 publications

Bouncing universe in the contexts of generalized cosmic Chaplygin gas and variable modified Chaplygin gas

Bouncing universe in the contexts of generalized cosmic Chaplygin gas and variable modified Chaplygin gas

LRS Bianchi I model with bulk viscosity in f(R,T) gravity

LRS Bianchi I model with constant expansion rate in $f(R,T)$ gravity

Contact Info

Product

Resources

About