Cosmology from HI galaxy surveys with the SKA
Cosmology from HI galaxy surveys with the SKA
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DOI：
10.22323/1.215.0017
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发表时间：
2015-01
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影响因子：
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通讯作者：
F. Abdalla;P. Bull;S. Camera;A. Benoit-Lévy;B. Joachimi;D. Kirk;H. Klockner;R. Maartens;A. Raccanelli;Mário G. Santos;Gong-Bo Zhao
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文献类型：
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作者：
F. Abdalla;P. Bull;S. Camera;A. Benoit-Lévy;B. Joachimi;D. Kirk;H. Klockner;R. Maartens;A. Raccanelli;Mário G. Santos;Gong-Bo Zhao
平方公里阵列（SKA）有可能产生星系红移调查，这将是竞争的其他国家的最先进的宇宙学实验在未来十年。在本章中，我们总结了SKA第一和第二阶段在其当前设计状态下能够实现的能力。我们总结了不同的宇宙学实验，这些实验在本书的其他章节中有更详细的描述。SKA将能够在其两个阶段产生具有竞争力的重子振荡（BAO）测量。SKA的第一阶段将在光学和红外实验中提供类似的测量，具有完全不同的系统效应，而第二阶段在其统计能力方面是转型的。SKA将产生非常精确的红移空间失真（RSD）测量，由于星系数量众多，在较低的红移下比其他实验优越上级。来自SKA的星系红移数据与射电连续谱巡天和光学巡天的交叉相关将提供非常好的光度红移校准以及非常好的重力修正界限。基于主成分分析（PCA）的方法，我们发现SKA将能够提供竞争约束暗能量和修改的引力模型。由于SKA覆盖的面积很大，这将是一个从最大尺度测量物理学的转型实验，例如来自fnl的非高斯信号。最后，SKA可能产生第一个对红移漂移的真实的时间测量。SKA将成为宇宙学的一台转型机器，因为它从早期的第一阶段发展到其全部力量。
The Square Kilometer Array (SKA) has the potential to produce galaxy redshift surveys which will be competitive with other state of the art cosmological experiments in the next decade. In this chapter we summarise what capabilities the first and the second phases of the SKA will be able to achieve in its current state of design. We summarise the different cosmological experiments which are outlined in further detail in other chapters of this Science Book. The SKA will be able to produce competitive Baryonic Oscillation (BAOs) measurements in both its phases. The first phase of the SKA will provide similar measurements in optical and IR experiments with completely different systematic effects whereas the second phase being transformational in terms of its statistical power. The SKA will produce very accurate Redshift Space Distortions (RSD) measurements, being superior to other experiments at lower redshifts, due to the large number of galaxies. Cross correlations of the galaxy redshift data from the SKA with radio continuum surveys and optical surveys will provide extremely good calibration of photometric redshifts as well as extremely good bounds on modifications of gravity. Basing on a Principle Component Analysis (PCA) approach, we find that the SKA will be able to provide competitive constraint on dark energy and modified gravity models. Due to the large area covered the SKA it will be a transformational experiment in measuring physics from the largest scales such as non-Gaussian signals from fnl . Finally, the SKA might produce the first real time measurement of the redshift drift. The SKA will be a transformational machine for cosmology as it grows from an early Phase 1 to its full power.