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Consistency of the growth rate in different environments with the 6dF Galaxy Survey: measurement of the void-galaxy and galaxy-galaxy correlation functions

机译:6dF不同环境下增长率的一致性   银河调查:测量空隙 - 星系和星系 - 星系的相关性   功能

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摘要

We present a new test of gravitational physics by comparing the growth rateof cosmic structure measured around voids with that measured around galaxies inthe same large-scale structure dataset, the low-redshift 6-degree Field GalaxySurvey. By fitting a self-consistent Redshift Space Distortion model to the 2Dgalaxy-galaxy and void-galaxy correlation functions, we recover growth ratevalues f\sigma_8 = 0.42 \pm 0.06 and 0.39 \pm 0.11, respectively. Theenvironmental-dependence of cosmological statistics can potentiallydiscriminate between modified-gravity scenarios which modulate the growth rateas a function of scale or environment and test the underlying assumptions ofhomogeneity and isotropy.
机译:通过比较在相同大规模结构数据集(低红移6度视场GalaxySurvey)中在空隙周围测量的宇宙结构与在银河周围测量的宇宙结构的增长率,我们提出了一种引力物理学的新测试。通过将自洽的Redshift空间失真模型拟合到2Dgalaxy-galaxy和void-galaxy相关函数,我们分别恢复了增长率值f \ sigma_8 = 0.42 \ pm 0.06和0.39 \ pm 0.11。宇宙统计学的环境依赖性可以在重力修正方案之间进行区分,重力修正方案根据规模或环境调节增长率,并检验均质性和各向同性的基本假设。

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