Probing the largest cosmological scales with the correlation between the cosmic microwave background and peculiar velocities
Probing the largest cosmological scales with the correlation between the cosmic microwave background and peculiar velocities
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DOI：
10.1103/physrevd.76.103523
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发表时间：
2007-11
影响因子：
5
通讯作者：
P. Fosalba;O. Doré
中科院分区：
文献类型：
--
作者：
P. Fosalba;O. Doré
宇宙微波背景辐射（CMB）与大尺度结构之间的互相关是在最大物理尺度上研究暗能量和引力的有力工具。我们介绍了一种新的估计，CMB速度相关性，它有大部分的权力在大尺度上，在低红移，提供高达2倍的信噪比比最近检测到的CMB暗物质密度相关性预期从集成的萨克斯-沃尔夫效应。我们建议使用从Ia型超新星和动力学Sunyaev-Zeldovich星团调查测量的奇特速度的组合来揭示这个信号，并预测未来调查可以实现的暗能量约束。我们强调，低红移特有的速度测量应利用互补的更深的大尺度结构调查的精密宇宙学。
Cross correlation between the cosmic microwave background (CMB) and large-scale structure is a powerful probe of dark energy and gravity on the largest physical scales. We introduce a novel estimator, the CMB-velocity correlation, that has most of its power on large scales and that, at low redshift, delivers up to a factor of 2 higher signal-to-noise ratio than the recently detected CMB-dark matter density correlation expected from the integrated Sachs-Wolfe effect. We propose to use a combination of peculiar velocities measured from supernovae type Ia and kinetic Sunyaev-Zeldovich cluster surveys to reveal this signal and forecast dark energy constraints that can be achieved with future surveys. We stress that low redshift peculiar velocity measurements should be exploited with complementary deeper large-scale structure surveys for precision cosmology.