Cosmology on the Largest Scales with the SKA
Cosmology on the Largest Scales with the SKA
复制标题
SKA 的最大尺度宇宙学
DOI：
10.22323/1.215.0025
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Y. Xu
中科院分区：
文献类型：
--
作者：
S. Camera;A. Raccanelli;P. Bull;D. Bertacca;X. Chen;P. Ferreira;M. Kunz;R. Maartens;Y. Mao;M. G. Santos;P. Shapiro;M. Viel;Y. Xu
对超大尺度宇宙的研究是平方公里阵列(SKA)的主要科学案例之一。SKA将能够探测大量的宇宙，从而在下一代宇宙学实验中代表着一种独特的工具，用于在最大的宇宙尺度上仔细研究宇宙的性质。在极大的尺度上探测宇宙结构将有许多好处。例如，对于这些模，微扰的增长是很好理解的，因为它完全在线性区域内。此外，这些标度不受重子物理学知之甚少的反馈的影响。在超大宇宙尺度上，两个关键效应变得重要：原始的非高斯性和对宇宙学观测的相对论修正。此外，如果后期加速不是由暗能量驱动的，而是由广义相对论的修正驱动的，那么这种修正在地平线尺度附近和上方应该会变得明显。因此，预计SKA将提供对非高斯性的转型约束，并首次在超地平线尺度上探测重力。
The study of the Universe on ultra-large scales is one of the major science cases for the Square Kilometre Array (SKA). The SKA will be able to probe a vast volume of the cosmos, thus representing a unique instrument, amongst next-generation cosmological experiments, for scrutinising the Universe's properties on the largest cosmic scales. Probing cosmic structures on extremely large scales will have many advantages. For instance, the growth of perturbations is well understood for those modes, since it falls fully within the linear regime. Also, such scales are unaffected by the poorly understood feedback of baryonic physics. On ultra-large cosmic scales, two key effects become significant: primordial non-Gaussianity and relativistic corrections to cosmological observables. Moreover, if late-time acceleration is driven not by dark energy but by modifications to general relativity, then such modifications should become apparent near and above the horizon scale. As a result, the SKA is forecast to deliver transformational constraints on non-Gaussianity and to probe gravity on super-horizon scales for the first time.