The locally rotationally symmetric Bianchi type-II magnetized string cosmological model with bulk viscous fluid is investigated.The magnetic field is due to an electric current produced along the x−axis.Thus the magne...The locally rotationally symmetric Bianchi type-II magnetized string cosmological model with bulk viscous fluid is investigated.The magnetic field is due to an electric current produced along the x−axis.Thus the magnetic field is in the y–z plane and F23 is the only non−vanishing component of electromagnetic field tensor Fij.To obtain the deterministic model in terms of cosmic time t,we have assumed the conditionξθ=const,whereξis the coefficient of bulk viscosity andθis the expansion in the model.展开更多
We investigate the Bianchi type-V magnetized string cosmological model with variable magnetic permeability for viscous fluid distribution. The magnetic field is due to an electric current produced along the x-axis. Th...We investigate the Bianchi type-V magnetized string cosmological model with variable magnetic permeability for viscous fluid distribution. The magnetic field is due to an electric current produced along the x-axis. Thus the magnetic field is in yz-plane and F23 is the only non-vanishing component of electromagnetic field tensor Fij. To obtain the deterministic model in terms of cosmic time t, we assume the condition ξθ const where ξ is the coefficient of bulk viscosity and θ the expansion in the model.展开更多
The present study deals with Bianchi type-IX string cosmological models for perfect fluid distribution. We consider two cases： （i） ρ ＋ λ = 0, （ii） ρ - λ = 0, where ρ and λ are the rest energy density and t...The present study deals with Bianchi type-IX string cosmological models for perfect fluid distribution. We consider two cases： （i） ρ ＋ λ = 0, （ii） ρ - λ = 0, where ρ and λ are the rest energy density and the tension density of a string cloud, respectively. The physical and geometrical properties of the models are discussed.展开更多
文摘The locally rotationally symmetric Bianchi type-II magnetized string cosmological model with bulk viscous fluid is investigated.The magnetic field is due to an electric current produced along the x−axis.Thus the magnetic field is in the y–z plane and F23 is the only non−vanishing component of electromagnetic field tensor Fij.To obtain the deterministic model in terms of cosmic time t,we have assumed the conditionξθ=const,whereξis the coefficient of bulk viscosity andθis the expansion in the model.
文摘We investigate the Bianchi type-V magnetized string cosmological model with variable magnetic permeability for viscous fluid distribution. The magnetic field is due to an electric current produced along the x-axis. Thus the magnetic field is in yz-plane and F23 is the only non-vanishing component of electromagnetic field tensor Fij. To obtain the deterministic model in terms of cosmic time t, we assume the condition ξθ const where ξ is the coefficient of bulk viscosity and θ the expansion in the model.
文摘The present study deals with Bianchi type-IX string cosmological models for perfect fluid distribution. We consider two cases： （i） ρ ＋ λ = 0, （ii） ρ - λ = 0, where ρ and λ are the rest energy density and the tension density of a string cloud, respectively. The physical and geometrical properties of the models are discussed.
