标题： 柱对称非均匀宇宙中的弦宇宙模型 II 显示英文标题

标题： String Cosmological Model in Cylindrically Symmetric Inhomogeneous Universe with Electromagnetic Field II

摘要： 柱对称非均匀弦宇宙模型在电磁场存在下的研究。 我们假设电磁场张量 F_{12}是唯一非零的分量 F_{ij}。 麦克斯韦方程表明 F_{12}是$x$的函数，而磁导率是 x 和 t 的函数。 为了得到确定性解，假设模型中的膨胀（$\theta$）与剪切张量$\sigma^{i}_{j}$的特征值$\sigma^{1}_{1}$成正比。 还讨论了该模型的一些物理和几何性质。 显示英文摘要

摘要： Cylindrically symmetric inhomogeneous string cosmological model of the universe in presence of electromagnetic field is investigated. We have assumed that F_{12} is the only non-vanishing component of electromagnetic field tensor 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 ($\theta$) in the model is proportional to the eigen value $\sigma^{1}_{1}$ of the shear tensor $\sigma^{i}_{j}$. Some physical and geometric prperties of the model are also discussed.