论文标题
在晚期宇宙中角度红移波动引起的重力的层析成像限制
Tomographic Constraints on Gravity from Angular Redshift Fluctuations in the Late Universe
论文作者
论文摘要
星系红移的天空图的波动，称为角红移波动（ARF），包含有关结构生长速度和宇宙中重力性质的精确信息。具体而言，ARF限制了宇宙学参数的组合$ h/h_0 \，fσ_8（z）$，同时是一种本质上的层析成像探测器，并且在很大程度上对许多观察性系统性错误不敏感，而无需假设在给定的赋予信托的社会学下的任何红色距离之间的关系。我们通过使用Boss Lowz+CMASS DR12 Galaxy样品介绍了从ARF得出的第一个宇宙学约束，在$ h_0fσ_8（z）$上获得了7 \％ - 准确的限制，以超过20个红移$ z \ in [0.26,0.72] $。我们最合适的价值是$ 10 \％$大，但在$1.4σ$级别上兼容，比{\ it planck}设置的$λ$ CDM期望观察到了宇宙微波背景（CMB）辐射的观察。我们的层析成像测量与这些CMB数据相结合，在重力指数$γ$，$γ= 0.44^{+0.09} _ { - 0.07} $上提供了最强的约束之一，该预测来自$2σ$的一般相对论（$γ___{\ rm grm gr}} 0.55 $ sime。
Fluctuations in sky maps of the galaxy redshifts, dubbed as angular redshift fluctuations (ARF), contain precise information about the growth rate of structures and the nature of gravity in the Universe. Specifically, ARF constrain the combination of cosmological parameters $H/H_0\,fσ_8(z)$, while being an intrinsically tomographic probe and largely insensitive to many observational systematic errors, all this without requiring the assumption of any redshift-to-distance relation under a given fiducial cosmology. We present the first cosmological constraints derived from ARF by using BOSS LOWZ+CMASS DR12 galaxy samples, obtaining 7\%-accurate constraints on $H/H_0 fσ_8(z)$ at more than 20 redshifts over the range $z \in [0.26,0.72]$. Our best-fitting value is $10\%$ larger, but compatible at the $1.4σ$ level, than the $Λ$CDM expectation set by {\it Planck} observations of the Cosmic Microwave Background (CMB) radiation. Our tomographic measurements, combined with these CMB data, provides one of the strongest constraints on the gravity index $γ$, $γ=0.44^{+0.09}_{-0.07}$, which lies within $2σ$ from the prediction of General Relativity ($γ_{\rm GR}\simeq 0.55$).
