共查询到20条相似文献，搜索用时 15 毫秒
1.
V. U. M. Rao T. Vinutha M. Vijaya Shanthi K. V. S. Sireesha 《Astrophysics and Space Science》2008,315(1-4):211-214
Exact Bianchi type-V cosmological models are obtained in a scalar-tensor theory of gravitation proposed by Brans and Dicke (Phys. Rev. 124:925, 1961) in the presence of perfect fluid distribution. Some physical and geometrical properties of the models are also discussed. 相似文献
2.
An exact Bianchi type-V cosmological model is obtained in a scalar-tensor theory of gravitation proposed by Saez and Ballester
(Phys. Lett. A 113:467, 1986) in case of perfect fluid distribution. Some physical properties of the model are also discussed. 相似文献
3.
Spatially-homogeneous and anisotropic Bianchi type-III, V, VI0 cosmological models in Rosen's (1973) bimetric theory of gravitation are considered. It is shown that, in each case, when
the soure of the gravitation field is a perfect fluid distribution Bianchi type cosmological models do not exist. Hence vacuum
models are presented and studied.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
4.
The spatially-homogeneous and anisotropic cosmological model in self-creation theory of gravitation proposed by Barber, is obtained in the presence of perfect fluid with disordered radiation and the metric is of Bianchi type-V. Some physical properties of the model are discussed. 相似文献
5.
An exact Bianchi type-V perfect fluid cosmological model is obtained in a scalar tensor theory proposed by Sen (Z. Phys. 149:311,
1957) based on Lyra Manifold in case of β is a constant and it is shown that this cosmological model exists only in the case of Radiation Universe (ρ=3p) if β is a function of ‘t’ using negative constant deceleration parameter. Some physical and geometrical properties of these models are discussed. 相似文献
6.
A spatially homogeneous and anisotropic Bianchi type-V space–time is considered in the frame work of a scale covariant theory of gravitation proposed by Canuto et al. (Phys. Rev. Lett. 39:429, 1977) when the matter sources is a bulk viscous fluid containing one dimensional cosmic strings. Using some physically plausible conditions, we have obtained a determinate solution of the field equations of the theory which represents a Bianchi type-V bulk viscous string cosmological model in this theory. Some physical and kinematical properties of the model are also discussed. 相似文献
7.
G. P. Horedt 《Astrophysics and Space Science》1989,158(1):169-171
It is shown that there do not exist spatially-homogeneous and anisotropic Bianchi type-I cosmological models in Rosen's (1973) bi-metric theory of gravitation when the source of the gravitational field is a perfect fluid distribution. A vacuum cosmological model, in this theory, is presented and studied. 相似文献
8.
J. K. Singh 《Astrophysics and Space Science》2007,310(3-4):241-244
Some New Bianchi type-V cosmological models, incorporating heat flow and null radiation flow, along with perfect fluid distribution
have been discussed. The physical and kinematical behaviors of the models have been analyzed. 相似文献
9.
R. Chaubey 《Astrophysics and Space Science》2012,342(2):499-509
The Bianchi type-V cosmological model with viscous fluid and creation particle in Brans-Dicke theory has been considered. The present paper deals with Bianchi type-V cosmological model with bulk viscosity and particle creation described by full causal thermodynamics in Brans-Dicke theory. We have discussed two types of solutions of the average scale factor for a Bianchi type-V model by using a variation law of Hubble’s parameter, which yields a constant value of the deceleration parameter. The exact solutions to the corresponding field equations are obtained in quadrature form. The solutions to the Einstein field equations are obtained for power law and exponential form. The cosmological parameters have been discussed in detail. 相似文献
10.
Spatially homogeneous Bianchi type-II, VIII & IX charged perfect fluid cosmological models in Brans-Dicke theory of gravitation
are obtained and presented. Various physical and geometrical features of the models are also discussed. 相似文献
11.
Spatially-homogeneous and anisotropic Bianchi type-VI0 cosmological models are obtained in the scalar-tensor theory of gravitation proposed by Schwinger, both in vacuum and in the presence of perfect fluid with pressure equal to energy density. Some properties of the models are discussed. 相似文献
12.
Spatially-homogenous and anisotropic Bianchi type-VI0 cosmological models are obtained, in Barber's second self-creation theory of gravitation, both in vacuum and in the presence of perfect fluid with pressure equal to energy density. Some properties of the model are discussed. 相似文献
13.
Anisotropic spatially homogeneous Bianchi type-I cosmological model in bimetric theory of gravitation (Rosen, 1973) is considered.
It is shown that the Bianchi type-I cosmological model does not exist in case of both meson field and mesonic perfect fluid
(with or without mass parameter). Hence only vacuum models can be obtained (Reddy and Venkateswarlu, 1989).
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
14.
Spatially-homogeneous and anisotropic Bianchi type-I cosmological models are obtained, in Barber's second self-creation theory of gravitation, when the source of the gravitational field is a perfect fluid. Some physical and geometrical properties of the models are discussed. 相似文献
15.
Four- and five-dimensional Bianchi type-III cosmological model in Rosen (1980) bimetric theory of gravitation is considered.
Restricting to a particular type of background metric, it is observed that the Bianchi type-III cosmological model does not
exist in case of both meson field and mesonic perfect fluid. Hence only vacuum model can be obtained. 相似文献
16.
Hugo Levato Stella Malaroda Beatriz García Nidia Morrell Gladys Solivella Monica Grosso 《Astrophysics and Space Science》1991,183(1):147-153
Spatially-homogenous and anisotropic Bianchi type-II and III cosmological models are obtained in Barber's second self-creation theory of gravitation both in vacuum and in the presence of perfect fluid with pressure equal to energy density. Some properties of the models are discussed. 相似文献
17.
It is shown that the relativistic analogues of vacuum Bianchi type-V cosmological models, in the scalar-tensor theories of gravitation proposed by Ross and Dunn, do not exist. 相似文献
18.
Field equations in a scalar-tensor theory of gravitation proposed by Saezand Ballester (1985) are obtained with the aid of
(i) Friedmann-type metric (ii) a non static plane symmetric metric and (iii) spatially homogeneous Bianchi type – III metric.
Some cosmological models corresponding to perfect fluid and bulk viscous fluid are presented. Physical and kinematical properties
of the models are also discussed.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
19.
We have studied the evolution of homogeneous and anisotropic Bianchi type-I cosmological models filled with perfect fluid
in Barber second self-creation theory by assuming a special law of variation for Hubble’s parameter that yield a constant
value of deceleration parameter. Some physical consequences of the models have been discussed in case of Zel’dovich fluid
and radiation dominated fluid. 相似文献
20.
An axially symmetric Bianchi type-I space-time is considered in the presence of perfect fluid source in the scale-covariant
theory of gravitation formulated by Canuto et al. [1977a, Phys. Rev. Lett. 39, 429]. With the help of special law of variation for Hubble’s parameter proposed by Bermann [1983, Nuovo Cimento 74B, 182] a cosmological model with a negative constant declaration parameter is obtained in this theory. Some physical properties
of the model are also discussed. 相似文献