Some spatially homogeneous string cosmological models

LRS Bianchi type-I string cosmological models are studied in the frame work of general relativity when the source for the energy momentum tensor is a bulk viscous fluid containing one dimensional strings embedded in electromagnetic field. A barotropic equation of state for the pressure and density is assumed to get determinate solutions of the field equations. The bulk viscosity is assumed to be inversely proportional to the scalar expansion. The physical and kinematical properties of the models are discussed. The effect of viscosity and electromagnetic field on the physical and kinematical properties is also investigated.

mentioning

confidence: 96%

String fluid cosmological models in general relativity

Tripathy

Nayak²,

Sahu

et al. 2008

“…Patel and Maharaj [27] investigated stationary rotating world model with magnetic field. Ram and Singh [28] obtained some new exact solution of string cosmology with and without a source free magnetic field for Bianchi type I space-time in the different basic form considered by Carminati and McIntosh [29]. Singh and Singh [30] investigated string cosmological models with magnetic field in the context of space-time with G 3 symmetry.…”

Section: Introductionmentioning

confidence: 99%

Cylindrically symmetric inhomogeneous universe with electromagnetic field in string cosmology

Pradhan

Rai

Singh³

2007

Cylindrically symmetric inhomogeneous string cosmological model in presence of electromagnetic field is investigated. We have assumed that F 12 is the only non-vanishing component of F ij . The Maxwell's equations show that F 12 is the function of x alone whereas the magnetic permeability is the function of x and t both. To get the deterministic solution, it has been assumed that the expansion (θ) in the model is proportional to the eigen value 1 1 σ of the shear tensor .i j σ The physical and geometric aspects of the model are also discussed.

“…Besides the pioneer works of Letelier (1983) and Stachel (1980), , , Yadav et al (2007aYadav et al ( , 2007b, Banerjee et al (1990), Rahaman et al (2003), Ram and Singh (1995), Singh and Singh (1999), Tikekar and Patel (1992), Reddy (2003aReddy ( , 2003b, Pradhan et al (2007), Katore and Rane (2006), Bali and Anjali (2006), Tripathy et al (2008aTripathy et al ( , 2008bTripathy et al ( , 2009) have studied string cloud cosmology. String cosmologies with bulk viscosity have been studied by Wang (2004Wang ( , 2005Wang ( , 2006, Bali et al ( , 2008 and Tripathy et al (2008b).…”

mentioning

confidence: 98%

Bulk viscous string cosmological models with electromagnetic field

Tripathy

Nayak²,

Sahu

et al. 2009

LRS Bianchi type-I string cosmological models are studied in the frame work of general relativity when the source for the energy momentum tensor is a bulk viscous stiff fluid containing one dimensional strings embedded in electromagnetic field. The bulk viscosity is assumed to be inversely proportional to the scalar expansion. The physical and kinematical properties of the models are discussed. The effects of Viscosity and electromagnetic field on the physical and kinematical properties are also investigated.