利用红移畸变重建结构形成的历史
Reconstructing the history of structure formation using redshift distortions
摘要：
利用红移空间扭曲来测量星系特有速度的统计数据是探索结构形成历史的一个很好的方法。由于星系被期望作为物质流中的测试粒子，这种方法避免了由于未知的星系密度偏差而导致的不确定性。我们表明，红移空间失真测量的参数组合，$fσ_8^{\rm mass}$提供了一个很好的测试暗能量模型，即使没有知识的偏见或$σ_8^{\rm mass}$需要提取$f$从这个测量（这里$f$是对数导数的线性增长率，和$σ_8^{\rm mass}$是均方根质量波动半径为$8h^{-1}$ Mpc的球体）。我们认为，红移空间畸变测量将有助于确定宇宙加速背后的物理学，测试它是否与暗能量或修改的重力，并将提供一个机会来测试可能的暗能量聚集或耦合之间的暗能量和暗物质。如果我们能够测量星系的偏差，同时测量过密度场和速度场，可以通过连续性方程来检验等效原理的有效性。
英文摘要：
Measuring the statistics of galaxy peculiar velocities using redshift-space distortions is an excellent way of probing the history of structure formation. Because galaxies are expected to act as test particles within the flow of matter, this method avoids uncertainties due to an unknown galaxy density bias. We show that the parameter combination measured by redshift-space distortions, $fσ_8^{\rm mass}$ provides a good test of dark energy models, even without the knowledge of bias or $σ_8^{\rm mass}$ required to extract $f$ from this measurement (here $f$ is the logarithmic derivative of the linear growth rate, and $σ_8^{\rm mass}$ is the root-mean-square mass fluctuation in spheres with radius $8h^{-1}$Mpc). We argue that redshift-space distortion measurements will help to determine the physics behind the cosmic acceleration, testing whether it is related to dark energy or modified gravity, and will provide an opportunity to test possible dark energy clumping or coupling between dark energy and dark matter. If we can measure galaxy bias in addition, simultaneous measurement of both the overdensity and velocity fields can be used to test the validity of equivalence principle, through the continuity equation.
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