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arXiv 0708.0107gr-qc
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具有可变宇宙项$Λ$的非均匀磁对称宇宙中的磁化弦宇宙学模型

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

Anirudh Pradhan

摘要:

研究了宇宙项$Λ$随时间变化的非均匀磁化弦宇宙学模型.为了获得确定性解,假设模型中的展开($θ$)与剪切张量$σ^{i}_{j}$的本征值$σ^{1}_{1}$成比例。该模型的宇宙学常数值较小且为正值,这一结果得到了最近Ia超新星观测结果的支持。讨论了该模型在有无磁场作用下的物理和几何性质。

英文摘要:

Cylindrically symmetric inhomogeneous magnetized string cosmological model is investigated with cosmological term $Λ$ varying with time. To get the deterministic solution, it has been assumed that the expansion ($θ$) in the model is proportional to the eigenvalue $σ^{1}_{1}$ of the shear tensor $σ^{i}_{j}$. 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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