de Sitter expansion with anisotropic fluid in Bianchi type-I space-time

Akarsu, Özgür; Kilinç, Can Battal

doi:10.1007/s10509-009-0254-9

Cited by 81 publications

(43 citation statements)

References 37 publications

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“…In literature, many authors have considered totally anisotropic Bianchi-I space-times with only two skewness parameters of DE [39,40]. Finally, we assume that ω = const.…”

Section: Solution Of the Field Equationsmentioning

confidence: 99%

Anisotropic dark energy models with constant deceleration parameter

Kumar

Singh

2010

Gen Relativ Gravit

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We consider a spatially homogeneous and totally anisotropic Bianchi-I space-time with perfect fluid (dark matter and standard visible matter) and anisotropic dark energy, which has dynamical energy density. The two sources are assumed to interact minimally and therefore their energy momentum tensors are conserved separately. Using suitable physical assumptions, the field equations are solved exactly. Various dark energy models are studied and it is found that quintessence model is suitable for describing the present evolution of the universe. The geometrical and kinematical features of the models and the behavior of the anisotropy of the dark energy, are examined in detail.

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“…In literature, many authors have considered totally anisotropic Bianchi-I space-times with only two skewness parameters of DE [39,40]. Finally, we assume that ω = const.…”

Section: Solution Of the Field Equationsmentioning

confidence: 99%

Anisotropic dark energy models with constant deceleration parameter

Kumar

Singh

2010

Gen Relativ Gravit

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“…Mota (2008a, 2008b) have investigated cosmological models with anisotropic EoS and have also shown that the present SN Ia data allows large anisotropy. Recently, Akarsu and Kilinc (2010c) have described some features of the Bianchi type-I universes in presence of fluid that wields an anisotropic EoS. Hence, for a realistic cosmological model one should consider spatially homogeneous and anisotropic space-times and then show whether they can evolve to the observed amount of homogeneity and isotropy.…”

Section: Introductionmentioning

confidence: 99%

Dark energy models with anisotropic fluid in Bianchi Type-VI 0 space-time with time dependent deceleration parameter

Pradhan

Jaiswal

Jotania

et al. 2011

Astrophys Space Sci

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We present two dark energy (DE) models with an anisotropic fluid in Bianchi type-V I 0 space-time by considering time dependent deceleration parameter (DP). The equation of state (EoS) for dark energy ω is found to be time dependent and its existing range for derived models is in good agreement with the recent observations. Under the suitable condition, the anisotropic models approach to isotropic scenario. We also find that during the evolution of the universe, the EoS parameter for DE changes from ω > −1 to ω = −1 in first model whereas from ω > −1 to ω < −1 in second model which is consistent with recent observations. The cosmological constant is found to be a positive decreasing function of time and it approaches a small positive value at late time (i.e. the present epoch) which is corroborated by results from recent type Ia supernovae observations. The cosmic jerk parameter in our derived models is also found to be in good agreement with the recent data of astrophysical observations. The physical and geometric aspects of both the models are also discussed in detail.

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“…Following, Akarsu and Kilinc [37,38,50] and Yadav [21], we split the conservation of energy momentum tensor of the DE into two parts, one corresponds to deviations of EoS parameter and other is the deviation-free part of T (de)ij ;j = 0:…”

Section: Solution Of the Field Equations And Its Physical Significancementioning

confidence: 99%

Accelerating Dark Energy Models in Bianchi Type-v Spacetime

Pradhan

Amirhashchi

2011

Mod. Phys. Lett. A

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Some new exact solutions of Einstein's field equations have emerged in a spatially homogeneous and anisotropic Bianchi type-V space-time with minimally interacting perfect fluid and anisotropic dark energy (DE) components, which has dynamic equation of state (EoS). We consider Bianchi type-V space-time, introducing three different skewness parameters along spatial directions to quantify deviation of pressure from isotropy. To obtain the deterministic solution we choose the scale factor a(t) = √ t n e t , which yields a time-dependent deceleration parameter (DP). We find that the time dependent value of deceleration parameter is reasonable for the present day universe which yields a transition of the universe from the early decelerating phase to the recent accelerating phase. For different values of n, we can generate a class of physically viable DE models. It is found that quintessence model is suitable for describing the present evolution of the universe. The physical and geometric properties of spatially homogeneous and anisotropic cosmological models are discussed.

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de Sitter expansion with anisotropic fluid in Bianchi type-I space-time

Cited by 81 publications

References 37 publications

Anisotropic dark energy models with constant deceleration parameter

Anisotropic dark energy models with constant deceleration parameter

Dark energy models with anisotropic fluid in Bianchi Type-VI 0 space-time with time dependent deceleration parameter

Accelerating Dark Energy Models in Bianchi Type-v Spacetime

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