同时解释$Λ$、$G$和$σ^2$的模型
A Model to Explain Varying $Λ$, $G$ and $σ^2$ Simultaneously
摘要：
具有变化的宇宙参数的模型，早期被认为是恒定的，正在受到关注。然而，不同的模型通常被用来解释不同参数的演变。我们认为，任何物理过程是负责一个参数的演变，也应该负责其他的演变。这意味着不同的参数以某种方式耦合在一起。基于这一指导原则，我们研究了一个具有变量$Λ$和$G$的Bianchi I型模型，其中$Λ$、$G$和剪切参数$σ^2$都是耦合的.有趣的是，对于大的$t$，所得到的模型简化为FLRW模型，其中$G$接近常数。
英文摘要：
Models with varying cosmical parameters, which were earlier regarded constant, are getting attention. However, different models are usually invoked to explain the evolution of different parameters. We argue that whatever physical process is responsible for the evolution of one parameter, should also be responsible for the evolution of others. This means that the different parameters are coupled together somehow. Based on this guiding principle, we investigate a Bianchi type I model with variable $Λ$ and $G$, in which $Λ$, $G$ and the shear parameter $σ^2$, all are coupled. It is interesting that the resulting model reduces to the FLRW model for large $t$ with $G$ approaching a constant.
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