A bound system in the expanding universe with modified holographic Ricci dark energy and dark matter

Li, En-Kun; Geng, Jin-Ling; Duan, Pengfei

doi:10.1007/s10509-014-2161-y

Cited by 2 publications

(2 citation statements)

References 74 publications

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“…In their work, the energy densities of DE are given as ρ h = 3αM 2 p H 2 g(R/H 2 ) and ρ R = 3αM 2 p Rf (H 2 /R), where f (x) and g(y) are functions of the variables R/H 2 and H 2 /R. Nowadays, various works show that the HDE model is in fairly good agreement with the observational data [35,36,37,38,39,40,41], and researches on different scenarios about the HDE can be found in Refs: [42,43,44,45,46,47,48,49,50,51,52,53].…”

Section: Introductionmentioning

confidence: 95%

Generalized holographic Ricci dark energy and generalized second law of thermodynamics in Bianchi Type I universe

Geng

Duan

2015

Gen Relativ Gravit

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Generalized second law of thermodynamics in the Bianchi type I universe with the generalized holographic Ricci dark energy model is studied in this paper. The behavior of dark energy's equation of state parameter indicates that it is matter-like in the early time of the universe but phantom-like in the future. By analysing the evolution of the deviations of state parameter and the total pressure of the universe, we find that for an anisotropic Bianchi type I universe, it transits from a high anisotropy stage to a more homogeneous stage in the near past. Using the normal entropy given by Gibbs' law of thermodynamics, it is proved that the generalized second law of thermodynamics does not always satisfied throughout the history of the universe when we assume the universe is enclosed by the generalized Ricci scalar radius Rgr. It becomes invalid in the near past to the future, and the formation of the galaxies will be helpful in explaining such phenomenon, for that the galaxies's formation is an entropy increase process. The negative change rates of the horizon entropy and internal entropy occur in different period indicates that the influences of galaxies formation is wiped from internal to the universe's horizon.

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Section: Introductionmentioning

confidence: 95%

Generalized holographic Ricci dark energy and generalized second law of thermodynamics in Bianchi Type I universe

Geng

Duan

2015

Gen Relativ Gravit

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“…(2) Dark matter theory. These theories believe that there may be the undetected matter at the moment, including the dark matter and dark energy 37 and so on. At present, the categories of these theories are most widely accepted, playing a central role in the explanation of the anomalies in observed galactic rotation.…”

Section: Dark Matter Theorymentioning

confidence: 99%

Some properties of dark matter field in the complex octonion space

Weng

2015

Int. J. Mod. Phys. A

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The paper aims to consider the electromagnetic adjoint-field in the complex octonion space as the dark matter field, describing some properties of dark matter, especially the origin, particle category, existence region, and force and so forth. Since J. C. Maxwell applied the algebra of quaternions to depict the electromagnetic theory, some scholars adopt the complex quaternion and octonion to study the physics property of electromagnetic and gravitational fields. In the paper, by means of the octonion operator, it is found that the gravitational field accompanies with one adjoint-field, which property is partly similar to that of electromagnetic field. And the electromagnetic field accompanies with another adjoint-field, which feature is partly similar to that of gravitational field. As a result the electromagnetic adjoint-field is able to be chosen as one candidate of the dark matter field. According to the electromagnetic adjoint-field, it is able to predict a few properties of dark matter, for instance, the particle category, interaction intensity, interaction distance, and existence region and so forth. The study reveals that the dark matter particle and gravitational resource both will be influenced by the gravitational strength and force. The dark matter field is capable of making a contribution to physics quantities of gravitational field, including the angular momentum, torque, energy, and force and so on. Further there may be comparatively more chances to discover the dark matter in some regions with the ultrastrong field strength, surrounding the neutral star, white dwarf, galactic nucleus, black hole, and astrophysical jet and so on.Comment: A few minor changes in the second version, due to the typewriting erro

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A bound system in the expanding universe with modified holographic Ricci dark energy and dark matter

Cited by 2 publications

References 74 publications

Generalized holographic Ricci dark energy and generalized second law of thermodynamics in Bianchi Type I universe

Generalized holographic Ricci dark energy and generalized second law of thermodynamics in Bianchi Type I universe

Some properties of dark matter field in the complex octonion space

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