Bianchi Type-I Massive String Magnetized Barotropic Perfect Fluid Cosmological Model in the Bimetric Theory of Gravitation

Abstract

We investigate the Bianchi type-I massive string magnetized barotropic perfect fluid cosmological model in Rosen's bimetric theory of gravitation with and without a magnetic field by applying the techniques used by Latelier (1979) and Stachel (1983. To obtain a deterministic model of the universe, it is assumed that the universe is filled with barotropic perfect fluid distribution. The physical and geometrical significance of the model are discussed. By comparing our model with the model of Bali et al. (2007), it is realized that there are no big-bang and big-crunch singularities in our model and 𝑇 = 0 is not the time of the big bang, whereas the model of Bali et al. starts with a big bang at 𝑇 = 0. Further, our model is in agreement with Bali et al.(2007) as time increases in the presence, as well as in the absence, of a magnetic field.

Perfect Fluid Coupled String Universe in <i>f(R,T)</i> Gravity

“…We consider the Bianchi type-VI 0 metric as (13) where the scale factors are functions of cosmic time t only. The energy-momentum tensor for a string of clouds with perfect fluid distribution is given as (14) in which denotes a four-velocity vector and denotes a space-like unit vector of the cloud string satisfying the conditions, and , for and is the proper energy density of the particle, p is the isotropic pressure, is the strings tension density.…”

“…Ram and Chandel [12] studied the dynamics of a magnetized string universe by assuming the hybrid expansion law. Using the Bianchi-type I metric, Gaikwad et al [13] analyzed the massive string magnetized barotropic perfect fluid cosmological model. Bali et al [14] have investigated a massive string magnetized barotropic perfect fluid cosmological model in general relativity using the Bianchi type I metric.…”

LRS Bianchi Type I Cosmological Models with Perfect Fluid and Dark Energy in Bimetric Theory of Gravitation

“…From equation (12) and (13), and using above equation (44) It is remarkable point that the Chaplygin gas model (48) and the quintessence model (38) …”

Bianchi Type I Magnetized Dark Energy Cosmological Model in Bimetric Theory of Gravitation

“…Numerous specialists have fostered the hypothesis and examined numerous models of the cosmos, in biometric theory of gravitation and concentrated on their way of behaving geometrically as well as physically. [30][31][32][33][34][35][36][37][38][39][40] In this paper, we will focus on the Bianchi type-I magnetised dark energy cosmological model in the bimetric theory of gravitation since it has a great deal more fidelity to the physics of spatial homogeneous cosmology.…”