论文标题
修饰的重力宇宙学中的星系群集统计
Galaxy Cluster Statistics in Modified Gravity Cosmologies
论文作者
论文摘要
如果宇宙的加速膨胀是由于晚期的一般相对性的修改所致，那么大规模上结构的增长也可能表现出与标准宇宙学的偏差。我们研究了星系簇大小的光晕的分布作为重力探针的统计。我们分析了具有相同初始条件和膨胀历史的几个匹配的N体模拟的输出，但使用DGP和F（R）重力使用各种参数。从每个模拟中，我们提取红移1、0.3和0处的群集质量函数，功率谱和平均成对速度。这三个统计均显示了重力理论之间的系统差异。平均成对速度为与电源谱和群集质量函数的测量所暗示的任何一般相对论的任何一般相对论提供了重要的一致性测试。即将进行的微波背景实验，包括Simons天文台和CMB-S4，将通过热阳光Sunyaev-Zeldovich效应检测数万个星系簇，并通过微波背景的镜头来探测其质量，并使用横向透镜效应或Kinyem sunyaev-Sunyaev-seeld效应。这些聚类测量值有望成为重力的实质性探针。
If the accelerated expansion of the universe is due to a modification of general relativity at late times, it is likely that the growth of structure on large scales would also display deviations from the standard cosmology. We investigate the statistics of the distribution of galaxy cluster-sized halos as a probe of gravity. We analyze the output of several matched N-body simulations with the same initial conditions and expansion histories but using both DGP and f (R) gravity with various parameters. From each simulation we extract the cluster mass function, power spectrum, and mean pairwise velocity at redshifts 1, 0.3, and 0. All three statistics display systematic differences between gravity theories. The mean pairwise velocity provides an important consistency test for any posited departure from general relativity suggested by measurements of the power spectrum and cluster mass function. Upcoming microwave background experiments, including Simons Observatory and CMB- S4, will detect tens of thousands of galaxy clusters via the thermal Sunyaev-Zeldovich effect, probe their masses with lensing of the microwave background, and potentially measure velocities using the transverse lensing effect or the kinematic Sunyaev-Zeldovich effect. These cluster measurements promise to be a substantial probe of modified gravity.
