Little Rip and Pseudo Rip Phenomena From Coupled Dark Energy

Brevik, Iver; Тимошкин, А. В.; Rabochaya, Y.

doi:10.1142/s0217732313501721

Cited by 13 publications

(13 citation statements)

References 43 publications

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“…The Little Rip and Pseudo Rip phenomena and the bounce cosmology interpreted as an inhomogeneous nonviscous dark fluid coupled with dark matter, are considered in Refs. [40,46]. Cosmological models in which the modification of gravity is described in terms of a viscous fluid are explored in Refs.…”

Section: Dark Energy Coupled With Dark Matter In Viscous Fluid Cosmologymentioning

confidence: 99%

“…We will study a cosmological system with two coupled fluids: a dark energy component with a linear inhomogeneous EoS, and a dark matter component with a linear homogeneous EoS in a flat homogeneous and isotropic FRW universe. There exist other investigations dealing with the coupling between the inhomogeneous fluid dark energy and dark matter components [40,41]. We will explore bounce cosmological models where the scale factor is described by exponential as well as power-law forms and realize them in terms of the parameters of the EoS for the dark fluid.…”

Section: Introductionmentioning

confidence: 99%

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Inhomogeneous Dark Fluid and Dark Matter, Leading to a Bounce Cosmology

Brevik

Тимошкин

2015

Universe

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The purpose of this short review is to describe cosmological models with a linear inhomogeneous time-dependent equation of state (EoS) for the dark energy, when the dark fluid is coupled with dark matter. This may lead to a bounce cosmology. We consider equivalent descriptions in terms of the EoS parameters for an exponential, a power-law, or a double-exponential law for the scale factor $a$. Stability issues are discussed by considering small perturbations around the critical points for the bounce, in the early as well as in the late, universe. The latter part of the paper is concerned with dark energy coupled with dark matter in viscous fluid cosmology. We allow the bulk viscosity $\zeta=\zeta(H,t)$ to be a function of the Hubble parameter and the time, and consider the Little Rip, the Pseudo Rip, and the bounce universe. Analytic expressions for characteristic properties of these cosmological models are obtained.Comment: 13 pages, no figures. Mini-review, to appear in the MDPI journal Univers

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Section: Dark Energy Coupled With Dark Matter In Viscous Fluid Cosmologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inhomogeneous Dark Fluid and Dark Matter, Leading to a Bounce Cosmology

Brevik

Тимошкин

2015

Universe

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“…Albarran et al addressed the quantization of some little siblings of the Big Rip (LSBR) abrupt event with a phantom fluid [53,54]. Brevik and co workers have investigated different aspects of viscous LR and PR models [55][56][57][58]. Thermodynamics of LR cosmology in the framework of f (R, T ) gravity has been studied by Houndjo et al [67].…”

Section: Introductionmentioning

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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“…Such future singularities may be induced, for instance, by fluids with an inhomogeneous equation of state [21] or interacting coupled fluids [22]. From the viewpoint of viscous cosmological models, in Ref.…”

Section: Introductionmentioning

confidence: 99%

Cosmic anisotropic doomsday in Bianchi type I universes

Cataldo

Cid

Labraña

et al. 2016

Journal of Mathematical Physics

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In this paper we study finite time future singularities in anisotropic Bianchi type I models. It is shown that there exist future singularities similar to Big Rip ones (which appear in the framework of phantom Friedmann-Robertson-Walker cosmologies). Specifically, in an ellipsoidal anisotropic scenario or in a fully anisotropic scenario, the three directional and average scale factors may diverge at a finite future time, together with energy densities and anisotropic pressures. We call these singularities "Anisotropic Big Rip Singularities". We show that there also exist Bianchi type I models filled with matter, where one or two directional scale factors may diverge. Another type of future anisotropic singularities is shown to be present in vacuum cosmologies, i.e. Kasner spacetimes. These singularities are induced by the shear scalar, which also blows up at a finite time. We call such a singularity "Vacuum Rip". In this case one directional scale factor blows up, while the other two and average scale factors tend to zero.

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Little Rip and Pseudo Rip Phenomena From Coupled Dark Energy

Cited by 13 publications

References 43 publications

Inhomogeneous Dark Fluid and Dark Matter, Leading to a Bounce Cosmology

Inhomogeneous Dark Fluid and Dark Matter, Leading to a Bounce Cosmology

Phantom cosmology in an extended theory of gravity

Cosmic anisotropic doomsday in Bianchi type I universes

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