论文标题
大爆炸可能是各向异性的。 Bianchi I模型的情况
The Big Bang could be anisotropic. The case of Bianchi I model
论文作者
论文摘要
我们考虑了Bianchi I型同质宇宙的例子的各向异性宇宙学模型的演变。它是由物质和暗能与任意的状态（EOS）的混合物填充的。找到并分析了这种情况的一般解决方案。给出了该模型可能未来奇点的完整列表。为特定的EOSS获得了一些新的解决方案，例如对于Bianchi I型λCDM同质模型。结果表明，所有与不同EOSS相对应的特殊情况都具有共同的特性，前提是宇宙正在扩展，并且混合物的密度为正。然后，进化总是以各向异性的“大爆炸”开始，该“大爆炸”发生在有限的时间之前。之后，宇宙一直在不断扩展，在所有情况下，除了极少数例外，都会变得更加各向同性。尤其强大的各性化与通货膨胀时期有关。完成后，宇宙的扩展几乎变成各向同性，这种情况不能通过天文观测来与各向同性区分开。这一事实使我们可以将各向异性宇宙学模型视为对观察到的宇宙描述的可能候选者，尽管相同的膨胀模式。
We consider an evolution of anisotropic cosmological model on the example of the Bianchi type I homogeneous universe. It is filled by the mixture of matter and dark energy with an arbitrary barotropic equation of state (EoS). The general solution for this case is found and analyzed. A complete list of possible future singularities for this model is given. Some new solution were obtained for a particular EoSs, e.g. for the Bianchi type I ΛCDM homogeneous model. It is shown that all special cases corresponding to different EoSs have common properties, provided that now or at another moment of time the Universe is expanding, and the density of the mixture is positive. Then the evolution always begins with an anisotropic "Big Bang" which happened a finite time ago. After that the universe is constantly expanding and, in all cases, with rare exceptions, becomes more isotropic. A particularly strong isotropization is associated with the epoch of inflation. After its completion, the expansion of the universe becomes almost isotropic, and this case cannot be distinguished from isotropic by astronomical observations. This fact allows us to consider an anisotropic cosmological model as a possible candidate for the description of the observed Universe despite the isotropic pattern of expansion.
