Viscous Ricci dark energy

Feng, Chao-Jun; Li, Xinzhou

doi:10.1016/j.physletb.2009.09.013

Cited by 103 publications

(63 citation statements)

References 37 publications

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“…For simplification, we will devote ourselves to studying the case m = 1 2 , a similar form as taken in Refs. [15,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Spherical top-hat collapse of a viscous unified dark fluid

Wei

2014

Eur. Phys. J. C

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In this paper, we test the spherical collapse of a viscous unified dark fluid (VUDF) which has constant adiabatic sound speed and show the nonlinear collapse for VUDF, baryons, and dark matter, which are important in forming the large-scale structure of our Universe. By varying the values of the model parameters α and ζ 0 , we discuss their effects on the nonlinear collapse of the VUDF model, and we compare its result to the CDM model. The results of the analysis show that, within the spherical top-hat collapse framework, larger values of α and smaller values of ζ 0 make the structure formation earlier and faster, and the other collapse curves are almost distinguished with the curve of CDM model if the bulk viscosity coefficient ζ 0 is less than 10 −3 .

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“…For simplification, we will devote ourselves to studying the case m = 1 2 , a similar form as taken in Refs. [15,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Spherical top-hat collapse of a viscous unified dark fluid

Wei

2014

Eur. Phys. J. C

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“…In the present work we have extended the study of [62] on viscous holohraphic Ricci dark energy to extended holographic Ricci dark energy (EHRDE) under the influence of bulk viscosity. has been observed to exhibit a transition from EoS > −1 (quintessence) to EoS < −1 (phantom) at z ≈ 0.01 i.e.…”

Section: Discussionmentioning

confidence: 99%

“…In spite of the said limitations, because of simplicity of approach, Eckart theory has been adopted widely in the study of the accelerating universe filled with bulk viscous fluid (e.g. [60,62,63]). In the present work, we consider that in addition to the viscous EHRDE the universe also contains barotropic fluid, and consequently the Friedman equation and the corresponding equations of motion take the form [62]…”

Section: Eckart Approachmentioning

confidence: 99%

Viscous extended holographic Ricci dark energy in the framework of standard Eckart theory

Chattopadhyay¹

2016

Mod. Phys. Lett. A

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In the present work we report a study on the viscous extended holographic Ricci dark energy (EHRDE) model under the assumption of existence of bulk viscosity in the linear barotropic fluid and the EHRDE in the framework of standard Eckart theory of relativistic irreversible thermodynamics and it has been observed that the non-equilibrium bulk viscous pressure is significantly smaller than the local equilibrium pressure. We have studied the equation of state (EoS) parameter and observed that the EoS behaves like "quintom" and is consistent with the constraints set by observational data sets from SNLS3, BAO and Planck + WMAP9 + WiggleZ measurements in the reference S. Kumar and L. Xu, Phys. Lett. B,737, 244 (2014). Analysis of statefinder parameters has shown the possibility of attainment of ΛCDM phase under current model and at the same time it has been pointed out that the for z = 0 i.e. current universe, the statefinder pair is different from that of ΛCDM and the ΛCDM can be attained in a later stage of the universe. An analysis of stability has shown that although the viscous EHRDE along with viscous barotropic is classically unstable in the present epoch, it can lead to a stable universe in very late stage.Considering an universe enveloped by event horizon we have observed validity of generalized second law of thermodynamics.

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“…• The holographic principle: holographic dark energy [33][34][35][36], Ricci dark energy [37][38][39][40], agegraphic dark energy [41], tachyon model [42,43].…”

Section: Introductionmentioning

confidence: 99%

Traversable geometric dark energy wormholes constrained by astrophysical observations

Wang

Meng

2016

Eur. Phys. J. C

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In this paper, we introduce the astrophysical observations into the wormhole research. We investigate the evolution behavior of the dark energy equation of state parameter ω by constraining the dark energy model, so that we can determine in which stage of the universe wormholes can exist by using the condition ω < −1. As a concrete instance, we study the Ricci dark energy (RDE) traversable wormholes constrained by astrophysical observations. Particularly, we find from Fig. 5 of this work, when the effective equation of state parameter ω X < −1 (or z < 0.109), i.e., the null energy condition (NEC) is violated clearly, the wormholes will exist (open). Subsequently, six specific solutions of statically and spherically symmetric traversable wormhole supported by the RDE fluids are obtained. Except for the case of a constant redshift function, where the solution is not only asymptotically flat but also traversable, the five remaining solutions are all non-asymptotically flat, therefore, the exotic matter from the RDE fluids is spatially distributed in the vicinity of the throat. Furthermore, we analyze the physical characteristics and properties of the RDE traversable wormholes. It is worth noting that, using the astrophysical observations, we obtain the constraints on the parameters of the RDE model, explore the types of exotic RDE fluids in different stages of the universe, limit the number of available models for wormhole research, reduce theoretically the number of the wormholes corresponding to different parameters for the RDE model, and provide a clearer picture for wormhole investigations from the new perspective of observational cosmology.a

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Viscous Ricci dark energy

Cited by 103 publications

References 37 publications

Spherical top-hat collapse of a viscous unified dark fluid

Spherical top-hat collapse of a viscous unified dark fluid

Viscous extended holographic Ricci dark energy in the framework of standard Eckart theory

Traversable geometric dark energy wormholes constrained by astrophysical observations

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