标题： 带变宇宙项的柱对称非均匀宇宙中的磁化弦宇宙学模型$Λ$ 显示英文标题

标题： Magnetized String Cosmological Model in Cylindrically Symmetric Inhomogeneous Universe with Variable Cosmological-Term $Λ$

摘要： 柱对称非均匀磁化弦宇宙模型与随时间变化的宇宙项$\Lambda$被研究。 为了得到确定性解，假设模型中的膨胀（$\theta$）与剪切张量$\sigma^{i}_{j}$的本征值$\sigma^{1}_{1}$成正比。 该模型的宇宙常数值被发现是小而正的，这得到了最近超新星 Ia 观测结果的支持。 在存在和不存在磁场的情况下，还讨论了该模型的物理和几何性质。 显示英文摘要

摘要： Cylindrically symmetric inhomogeneous magnetized string cosmological model is investigated with cosmological term $\Lambda$ varying with time. To get the deterministic solution, it has been assumed that the expansion ($\theta$) in the model is proportional to the eigenvalue $\sigma^{1}_{1}$ of the shear tensor $\sigma^{i}_{j}$. The value of cosmological constant for the model is found to be small and positive which is supported by the results from recent supernovae Ia observations. The physical and geometric properties of the model are also discussed in presence and absence of magnetic field.