共查询到9条相似文献,搜索用时 4 毫秒
1.
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
2.
Bermann [Nuovo Cimento B (1983), 74, 182] presented a law of variation of Hubble’s parameter that yields constant deceleration
parameter models of the Universe. In this paper, we study some cosmological models with negative constant deceleration parameter
within the framework of Lyra geometry.
PACS Nos: 98.80 cq, 04.20 jb, 04.50 相似文献
3.
D. R. K. Reddy CH. C. S. V. V. R. Murthy R. Venkateswarlu 《Astrophysics and Space Science》2006,301(1-4):79-82
Field equations in the presence of a perfect fluid distribution are obtained in a scalar-tensor theory of gravitation proposed
by Saez and Ballester (Phys. Lett. 113, 1985, 467) with the aid of Einstein–Rosen cylindrically symmetric metric. A static vacuum model and a non-static stiff fluid
model are presented. The physical and geometrical properties of the stiff fluid model are studied. 相似文献
4.
5.
By adopting the co-moving coordinate system, an exact axially symmetric cosmological model with string dust cloud source is obtained in the framework of Brans-Dicke [Phys. Rev. 124, 925, (1961) Scalar – tensor theory of gravitation. Some physical and kinematical properties of the model are also discussed. 相似文献
6.
Axially symmetric cosmological models with cosmic string source are obtained in a scalar-tensor theory of gravitation proposed
by Saez and Ballester (Phys. Lett. A113, 467, 1985). The models obtained give us axially symmetric geometric (Nambu) string, p-string and Reddy string (Astrophys. Space Sci. 286, 2003b) in Saez-Ballester theory. Some physical properties of the models are also discussed. 相似文献
7.
A new class of exact solutions of Einstein's field equations with perfect fluid for an LRS Bianchi type-I spacetime is obtained by using a time dependent deceleration parameter. We have obtained a general solution of the field equations from which three models of the universe are derived: exponential, polynomial and sinusoidal form respectively. The behaviour of these models of the universe are also discussed in the frame of reference of recent supernovae Ia observations. 相似文献
8.
D. R. K. Reddy R. L. Naidu S. Atchuta Rao K. N. Devi 《Astrophysics and Space Science》2007,310(3-4):177-180
Field equations in the presence of cosmic string source are obtained in a scalar tensor theory of gravitation proposed by
Brans and Dicke (Phys. Rev. 124, 925 (1961)) with the aid of a five-dimensional Kaluza–Klein metric. An exact string cosmological model is presented which represents
a five-dimensional Reddy string (Astrophys. Space Sci. 286, 2003b) in Brans–Dicke theory. Some physical properties of the model are also discussed 相似文献