Cosmological models with constant deceleration parameter

Berman, Marcelo Samuel; Gomide, Fernando de Mello

doi:10.1007/bf00759327

Cited by 217 publications

(129 citation statements)

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“…Berman (1983), Berman and Gomide (1988), recently Kumar (2010) obtained some FRW cosmological models with constant DP and showed that the constant DP models stand adequately for our present view of different phases of the evolution of Universe. In this paper, we show how the constant deceleration parameter models with metric (1) behave in the presence of anisotropic DE.…”

Section: Solution Of Field Equationsmentioning

confidence: 55%

Some anisotropic dark energy models in Bianchi type-V space-time

Yadav

2011

Astrophys Space Sci

103

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The paper deals with Bianchi type V Universe, which has dynamical energy density. We consider Bianchi type V space-time, introducing three different skewness parameters along spatial directions to quantify the deviation of pressure from isotropy. To study the anisotropic nature of the dynamical dark energy, we assume that the skewness parameters are time dependent. It is found that the Universe achieves flatness in quintessence model. The physical behavior of the Universe has been discussed in detail.

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Section: Solution Of Field Equationsmentioning

confidence: 55%

Some anisotropic dark energy models in Bianchi type-V space-time

Yadav

2011

Astrophys Space Sci

103

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“…It has been common practice to use a constant DP. Berman [51], Berman and Gomide [52] proposed a law of variation of Hubble parameter in the FRW model that yields a constant value of DP, which subsequently leads to power-law and exponential forms of the average scale factor. The recent observations of SNe Ia (Riess et al [1], Perlmutter et al [2]) indicate that the universe is presently accelerating while there was decelerated expansion in the past, and the universe undergoes transition from decelerated expansion to accelerated expansion and vice-versa at present.…”

Section: Bianchi Type-i Modelmentioning

confidence: 99%

“…(28) we see that q< 0 for t < √ (2α) and q> 0 for t > √ (2α). It is worth mentioning that Shamir et al [54] have also presented exact solutions of Bianchi type I and V models in f(R T ) gravity theory by applying the law of variation of Hubble's parameter proposed by Berman [51], and Berman and Gomide [52]. Different models were used in that case.…”

Section: Bianchi Type-v Modelmentioning

confidence: 99%

Bianchi types I and V bulk viscous fluid cosmological models in f(R, T) gravity theory

Ram

Kumari

2014

Open Physics

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Central European Journal of PhysicsBianchi types I and V bulk viscous fluid cosmological models in (R T ) gravity theory Abstract:In this paper we present non-singular Bianchi types I and V cosmological models, in the presence of bulk viscous fluid and within the framework of f(R,T) gravity theory. Exact solutions to the field equations are obtained by choosing a particular form of the function f(R,T) and a special value for the average scale factor of the model, which corresponds to a time-dependent deceleration parameter. The cosmological models initially accelerate for a certain period of time and thereafter decelerate. The physical and kinematical properties of the models of the universe are discussed. PACS (2008):98. 80-k, 04.20.-q, 04.90.+e, 95.10-a, 95.55-h

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“…Consider power-law scale-factors, with constant deceleration parameter, like in the original papers by Berman (1983) and Berman and Gomide (1988).…”

Section: Accelerating Power-law Bd-universementioning

confidence: 99%