论文标题
用直接特殊的速度测试修饰的重力方案
Testing modified gravity scenarios with direct peculiar velocities
论文作者
论文摘要
黑暗能源的理论基础仍然未知，可能意味着需要修改宇宙学量表的重力定律。在这项研究中，我们研究了如何使用星系和直接特殊的速度自动和互相关函数将星系的聚类和运动用作修饰的重力理论的探针。我们在$λ$ CDM，DGP和$ F（R）$宇宙学的模拟中测量并拟合这些相关功能，并通过提取每个模型的特征参数，我们表明这些理论可以使用这些测量结果将这些理论与一般相对性区分开。我们提出了预测，表明有足够大的数据样本，该分析技术是一种竞争性探测器，可以帮助对允许的GR偏离限制。例如，一个奇特的速度调查达到$ z = 0.5 $，$ 20 \％$ $距离精度将将模型参数限制为3- $σ$ pusititive限制$ \ log_ {10} | f_ {r0} | <-6.45 $ for $ f（r）$重力和$ r_c> 2.88 \，c/h_0 $对于NDGP，假设是基于基金的GR模型。
The theoretical basis of dark energy remains unknown and could signify a need to modify the laws of gravity on cosmological scales. In this study we investigate how the clustering and motions of galaxies can be used as probes of modified gravity theories, using galaxy and direct peculiar velocity auto- and cross-correlation functions. We measure and fit these correlation functions in simulations of $Λ$CDM, DGP, and $f(R)$ cosmologies and, by extracting the characteristic parameters of each model, we show that these theories can be distinguished from General Relativity using these measurements. We present forecasts showing that with sufficiently large data samples, this analysis technique is a competitive probe that can help place limits on allowed deviations from GR. For example, a peculiar velocity survey reaching to $z=0.5$ with $20\%$ distance accuracy would constrain model parameters to 3-$σ$ confidence limits $\log_{10}|f_{R0}| < -6.45$ for $f(R)$ gravity and $r_c > 2.88 \, c/H_0$ for nDGP, assuming a fiducial GR model.
