局域宇宙引力场的重建
Reconstructing the gravitational field of the local universe
摘要：
在星系尺度上对引力的测试还处于起步阶段。作为第一步，系统地揭示星系的引力意义，我们映射三个基本的引力变量-牛顿的潜力，加速度和曲率-在星系环境的本地宇宙的距离约为200 Mpc。我们的方法结合了来自星系的贡献，在一个全天空的红移调查，从一个N体模拟托管低光度物体的晕，线性和准线性模式的密度场。我们使用这些变量的范围，以确定在何种程度上星系扩大范围的通用测试的重力，并能够约束特定类别的模型，它们具有特殊的意义。最后，我们调查即将到来的星系调查所提供的改进。
英文摘要：
Tests of gravity at the galaxy scale are in their infancy. As a first step to systematically uncovering the gravitational significance of galaxies, we map three fundamental gravitational variables -- the Newtonian potential, acceleration and curvature -- over the galaxy environments of the local universe to a distance of approximately 200 Mpc. Our method combines the contributions from galaxies in an all-sky redshift survey, halos from an N-body simulation hosting low-luminosity objects, and linear and quasi-linear modes of the density field. We use the ranges of these variables to determine the extent to which galaxies expand the scope of generic tests of gravity and are capable of constraining specific classes of model for which they have special significance. Finally, we investigate the improvements afforded by upcoming galaxy surveys.
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