Some Bianchi type-II cosmological models in Brans–Dicke theory

Singh, J. K.; Sharma, Nidhi

doi:10.1007/s10509-010-0319-9

Cited by 19 publications

(8 citation statements)

References 15 publications

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“…Moreover, recent observation data from WMAP require that the universe should achieve a slightly anisotropic special geometry in spite of the inflation [79,80,81,82]. Therefore, in an attempt to understand the observed small amount of anisotropy in the universe better, the Bianchi type models have been studied by several authors [83,84,85,86,87,88,89]. Our aims are to investigate the evolution of the Bianchi type I (BI) universe with the HDE and interacting dark matter (DM), and the GSLT for the accelerated expanding BI universe driven by DE and DM.…”

Section: Introductionmentioning

confidence: 99%

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: 99%

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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“…The simplest Bianchi family is the Bianchi type-I space time that contains the flat FRW universe as a special case. Several authors studied the cosmological models with constant and time dependent displacement field [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. The matter content universe is not expected to attain thermal equilibrium at the time of its evolution, it is evident that there would be heat flow in the universe.…”

Section: Introductionmentioning

confidence: 99%

Bianchi Type-I Cosmological Model with Null Radiation Flow

Singh

Rani

2015

Int J Theor Phys

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“…Adhav [40] explored Bianchi type III cosmological model with negative constant deceleration parameter in BD theory of gravity in the presence of perfect fluid. Singh and Sharma [41], Singh [42,43] studied Bianchi types models in the context of BD scalartensor theory of gravitation. Rao and Sudha [44] investigated Bianchi type V dark energy model in Brans dicke theory of gravitation.…”

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confidence: 99%

A Bianchi type-II dark-energy cosmology with a decaying Λ-term in the Brans–Dicke theory of gravity

2017

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This paper deals with a spatially homogeneous and totally anisotropic Bianchi type-V cosmological model within the framework of self interacting Brans Dicke theory of gravity in the background of anisotropic dark energy (DE) with variable equation of state (EoS) parameter and constant deceleration parameter. Constant deceleration parameter leads to two models of universe, i.e. power law model and exponential model. EoS parameter ω and its existing range for the models is in good agreement with the most recent observational data. We notice that ω given by (37) i.e ω(t) = log(k1t) is more suitable in explaining the evolution of the universe. The physical behaviors of the solutions have also been discussed using some physical quantities. Finally, we observe that despite having several prominent features, both of the DE models discussed fail in details.

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Some Bianchi type-II cosmological models in Brans–Dicke theory

Cited by 19 publications

References 15 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

Bianchi Type-I Cosmological Model with Null Radiation Flow

A Bianchi type-II dark-energy cosmology with a decaying Λ-term in the Brans–Dicke theory of gravity

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