论文标题
使用大规模结构中的重力红移来挽救对修饰重力的限制
Rescuing constraints on modified gravity using gravitational redshift in large-scale structure
论文作者
论文摘要
星系的分布提供了一个理想的实验室，以测试与一般相对论的偏差。特别是，红移空间扭曲通常用于将修改限制为泊松方程，该方程控制了暗物质聚类的强度。在这里，我们表明这些约束依赖于弱等价原理的有效性，而弱等效原理从未对暗物质组成部分进行测试。放松这种限制性假设会导致结构的生长的改变，这些生长完全退化，泊松方程引起的修改。这反过来迅速降低了红移空间扭曲的约束功能。但是，可以通过测量星系分布的重力红移来恢复这种变性，并且可以恢复对修饰重力的严格限制，这将通过即将生成的大规模结构调查可检测到这种效果。
The distribution of galaxies provides an ideal laboratory to test for deviations from General Relativity. In particular, redshift-space distortions are commonly used to constrain modifications to the Poisson equation, which governs the strength of dark matter clustering. Here, we show that these constraints rely on the validity of the weak equivalence principle, which has never been tested for the dark matter component. Relaxing this restrictive assumption leads to modifications in the growth of structure that are fully degenerate with modifications induced by the Poisson equation. This in turns strongly degrades the constraining power of redshift-space distortions. Such degeneracies can however be broken and tight constraints on modified gravity can be recovered by measuring gravitational redshift from the galaxy distribution, an effect that will be detectable by the coming generation of large-scale structure surveys.
