耦合多个 barotropic 完美流体的 Bianchi I 宇宙的解析解
广义相对论与量子宇宙学
2024-10-29 v3
摘要
我们考虑将多个具有线性状态方程的 comoving barotropic 完美流体耦合到 Bianchi I 几何中,其在广义相对论的框架下。该动力学的解可化简为积分,可以在特定情况下显式求解。特别地,我们获得了单个物种以及两个物种的显式解,前提是它们的 barotropic 指数满足某种关系。这些解包含并推广了文献中研究的不同模型。为了完整性,我们分析了物料能量密度的各种可能符号,获得了一个特别有趣的模型,其中一种异常物种会产生尺度因子的弹性(bounce),从而实现无奇点的宇宙,然后衰变为支配较大体积的非异常成分。
关键词
引用
@article{arxiv.2406.20070,
title = {Analytic solutions for the Bianchi I universe coupled to several barotropic perfect fluids},
author = {David Brizuela and Sara F. Uria},
journal= {arXiv preprint arXiv:2406.20070},
year = {2024}
}
备注
16 pages. For a better readability, the first version (arXiv:2406.20070v1) has been divided into two independent and self-consistent papers. The present one contains all the results corresponding to the Bianchi I model, while arXiv:2407.17307 contains all the analysis of the Bianchi IX model. Moreover, this new version also includes some plots, and is the version accepted for publication