论文标题
在没有FLRW背景的统计统计均匀，本地不均匀的宇宙玩具模型中观察
Observations in statistically homogeneous, locally inhomogeneous cosmological toy-models without FLRW backgrounds
论文作者
论文摘要
在构成爱因斯坦方程的精确宇宙解决方案的玩具模型中研究了观察结果，这些方程在统计学上是均匀但局部不均匀的，没有先验的FLRW背景，并且“结构”的演变相当缓慢。将平均红移距离关系和红移沿着两个模型中的每种模型中的500射线漂移与基于空间平均值的关系进行了比较。基于空间平均值的关系对平均红移距离关系进行了良好的再现，尽管在运动学反应是次等的模型中最有说服力的。在这两个模型中，平均红移漂移与平均红移的漂移明显不同。这表明红移漂移可能是测试反应猜想的重要工具，因为红移漂移似乎可以区分局部和全局效应。提出的用于计算红移漂移的方法是直接概括的，因此可以在一般的时空中相当轻松地计算该数量。
Observations are studied in toy-models constituting exact cosmological solutions to the Einstein equation which are statistically homogeneous but locally inhomogeneous, without an a priori introduced FLRW background and with "structures" evolving fairly slowly. The mean redshift-distance relation and redshift drift along 500 light rays in each of two models are compared to relations based on spatial averages. The relations based on spatial averages give a good reproduction of the mean redshift-distance relation, although most convincingly in the model where the kinematical backreaction is subpercent. In both models, the mean redshift drift clearly differs from the drift of the mean redshift. This indicates that redshift drift could be an important tool for testing the backreaction conjecture as redshift drift appears to distinguish between local and global effects. The method presented for computing the redshift drift is straightforward to generalize and can thus be utilized to fairly easily compute this quantity in a general spacetime.
