arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.14351astro-ph.CO
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在KiDS-1000、BOSS和2dFLenS中用星系-星系透镜和成团振幅测试重力

Testing gravity using galaxy-galaxy lensing and clustering amplitudes in KiDS-1000, BOSS and 2dFLenS

Chris Blake, Alexandra Amon, Marika Asgari, Maciej Bilicki, Andrej Dvornik, Thomas Erben, Benjamin Giblin, Karl Glazebrook, Catherine Heymans, Hendrik Hildebran… 展开作者

Chris Blake, Alexandra Amon, Marika Asgari, Maciej Bilicki, Andrej Dvornik, Thomas Erben, Benjamin Giblin, Karl Glazebrook, Catherine Heymans, Hendrik Hildebrandt, Benjamin Joachimi, Shahab Joudaki, Arun Kannawadi, Konrad Kuijken, Chris Lidman, David Parkinson, HuanYuan Shan, Tilman Tröster, Jan Luca van den Busch, Christian Wolf, Angus H. Wright

摘要:

宇宙学尺度上的引力物理学既影响着大尺度结构的组装速率,也影响着背景光通过这个宇宙网的引力透镜。通过比较这些不同观测信号的幅度,我们可以构建测试,将广义相对论与其潜在的修正区分开来。我们使用最新的弱引力透镜数据集从千度调查,KiDS-1000,结合重叠的星系光谱红移调查BOSS和2dFLenS,进行最精确的现有振幅比测试。我们在5个dz = 0.1的层析红移区间(0.2 < z < 0.7)中测量了相关的E_G统计量,误差为15-20%,投影尺度高达100 Mpc/h。这些测量的标度无关性和红移依赖性与广义相对论在物质密度Omega_m = 0.27 +/- 0.04的宇宙中的理论预期是一致的。我们表明,我们的结果是强大的对不同的分析选择,包括计划校正源光度红移误差的影响,并比较角和投影星系星系透镜统计的性能。

英文摘要:

The physics of gravity on cosmological scales affects both the rate of assembly of large-scale structure, and the gravitational lensing of background light through this cosmic web. By comparing the amplitude of these different observational signatures, we can construct tests that can distinguish general relativity from its potential modifications. We used the latest weak gravitational lensing dataset from the Kilo-Degree Survey, KiDS-1000, in conjunction with overlapping galaxy spectroscopic redshift surveys BOSS and 2dFLenS, to perform the most precise existing amplitude-ratio test. We measured the associated E_G statistic with 15-20% errors, in five dz = 0.1 tomographic redshift bins in the range 0.2 < z < 0.7, on projected scales up to 100 Mpc/h. The scale-independence and redshift-dependence of these measurements are consistent with the theoretical expectation of general relativity in a Universe with matter density Omega_m = 0.27 +/- 0.04. We demonstrate that our results are robust against different analysis choices, including schemes for correcting the effects of source photometric redshift errors, and compare the performance of angular and projected galaxy-galaxy lensing statistics.

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