arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1507.03086astro-ph.CO
收藏

RCSLenS:通过弱透镜和大尺度结构的互相关检验引力物理

RCSLenS: Testing gravitational physics through the cross-correlation of weak lensing and large-scale structure

Chris Blake, Shahab Joudaki, Catherine Heymans, Ami Choi, Thomas Erben, Joachim Harnois-Deraps, Hendrik Hildebrandt, Benjamin Joachimi, Reiko Nakajima, Ludovic … 展开作者

Chris Blake, Shahab Joudaki, Catherine Heymans, Ami Choi, Thomas Erben, Joachim Harnois-Deraps, Hendrik Hildebrandt, Benjamin Joachimi, Reiko Nakajima, Ludovic van Waerbeke, Massimo Viola

摘要:

暗能量的未知性质激发了对大尺度引力物理学的持续宇宙学测试。我们提出了一个新的一致性检查的基础上的相对振幅的非相对论性星系特有的运动,通过测量红移空间失真,和相对论性偏转光由这些相同的星系跟踪星系星系透镜。我们利用最新一代的深度,重叠的成像和光谱数据集,结合红星团序列透镜巡天(RCSLenS),加拿大-法国-夏威夷望远镜透镜巡天(CFHTLenS),WiggleZ暗能量巡天和重子振荡光谱巡天(BOSS)。我们用“引力滑移”统计量E_G来量化结果,我们估计在z=0.32时为0.48 +/- 0.10,在z=0.57时为0.30 +/- 0.07,后者构成了这个量已经确定的最高红移。这些测量结果与广义相对论的预言是一致的,对于受宇宙学常数支配的宇宙中的扰动Friedmann-Robertson-Walker度规,在这些相应的红移处E_G = 0.41和0.36。从当前和未来的星系巡天中获得的红移空间畸变和引力透镜数据的结合,将为基本宇宙学提供越来越严格的检验。

英文摘要:

The unknown nature of dark energy motivates continued cosmological tests of large-scale gravitational physics. We present a new consistency check based on the relative amplitude of non-relativistic galaxy peculiar motions, measured via redshift-space distortion, and the relativistic deflection of light by those same galaxies traced by galaxy-galaxy lensing. We take advantage of the latest generation of deep, overlapping imaging and spectroscopic datasets, combining the Red Cluster Sequence Lensing Survey (RCSLenS), the Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS), the WiggleZ Dark Energy Survey and the Baryon Oscillation Spectroscopic Survey (BOSS). We quantify the results using the "gravitational slip" statistic E_G, which we estimate as 0.48 +/- 0.10 at z=0.32 and 0.30 +/- 0.07 at z=0.57, the latter constituting the highest redshift at which this quantity has been determined. These measurements are consistent with the predictions of General Relativity, for a perturbed Friedmann-Robertson-Walker metric in a Universe dominated by a cosmological constant, which are E_G = 0.41 and 0.36 at these respective redshifts. The combination of redshift-space distortion and gravitational lensing data from current and future galaxy surveys will offer increasingly stringent tests of fundamental cosmology.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑