无FLRW背景的统计均匀、局域非均匀宇宙学玩具模型中的观测
Observations in statistically homogeneous, locally inhomogeneous cosmological toy-models without FLRW backgrounds
AI总结：
本文研究无FLRW背景的统计均匀、局域非均匀宇宙学玩具模型中的观测，通过比较平均红移-距离关系和红移漂移，发现红移漂移可区分局域与全局效应，是检验反作用猜想的重要工具。
摘要：
本文研究了爱因斯坦方程的精确宇宙学解构成的玩具模型中的观测，这些模型统计均匀但局域非均匀，未先验引入FLRW背景，且“结构”演化相当缓慢。将两个模型中各500条光射线的平均红移-距离关系和红移漂移，与基于空间平均的关系进行比较。基于空间平均的关系能很好地再现平均红移-距离关系，其中运动学反作用低于1%的模型表现最令人信服。在两个模型中，平均红移漂移均明显不同于平均红移的漂移。这表明红移漂移可能是检验反作用猜想的重要工具，因为它似乎能区分局域和全局效应。文中提出的红移漂移计算方法易于推广，因此可用于在一般时空中相当容易地计算该量。
英文摘要：
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.
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。
