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arXiv 2209.06911gr-qc
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两种流体的各向异性背景:物质和全息暗能量

Anisotropic background for two fluids: matter and holographic dark energy

M. Koussour, M. Bennai

摘要:

在广义相对论的框架下,讨论了以物质和全息暗能量两种流体作为宇宙内容的空间均匀各向异性Bianchi I型时空.为了得到爱因斯坦场方程的精确解,我们选择比例因子作为双曲函数,具体地,$a\left( t\right) =\sinh ^{\frac{1}{n}}\left( γt\right) $,其中$γ$和$n>0$是任意常数,这给了我们一个与时间相关的减速参数。然后在参数为:$γ$固定和$n>1$的条件下研究了我们的宇宙模型。我们的宇宙学解导致了一个早期的减速阶段,随后是目前观察到的加速阶段。进一步讨论了各向异性参数和其它一些物理参数。我们的结论是,我们的宇宙学模型是一致的,最近的天文观测结果。

英文摘要:

We discuss a spatially homogeneous and anisotropic Bianchi type-I space-time with two fluids as the content of the Universe: matter and holographic dark energy in the framework of general relativity. To get the exact solutions of Einstein's field equations, we choose the scale factor as a hyperbolic function, specifically, $a\left( t\right) =\sinh ^{\frac{1}{n}}\left( γt\right) $, where $γ$ and $n>0$ are arbitrary constants, which gives us a time-dependent deceleration parameter. Then we study our cosmological model under the conditions of the parameters as: $γ$ fixed and $n>1$. Our cosmological solutions led to an early deceleration phase followed by the current observed acceleration phase. Further, the anisotropic parameter and some other physical parameters are discussed. We conclude that our cosmological model is consistent with the results of recent astronomical observations.

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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