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arXiv 1606.03092astro-ph.CO
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不同环境中增长率与6dF星系巡天的一致性:空星系和星系-星系关联函数的测量

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

Ixandra Achitouv, Chris Blake, Paul Carter, Jun Koda, Florian Beutler

摘要:

我们提出了一个新的测试引力物理学通过比较周围的宇宙结构的增长率测量空洞周围的星系在相同的大尺度结构数据集,低红移6度场星系巡天测量。用自洽的红移空间畸变模型拟合星系-星系和空星系-星系的二维关联函数,得到星系-星系和空星系的增长率分别为fσ_8 = 0.42 \pm 0.06和0.39 \pm 0.11。宇宙学统计的环境依赖性可以潜在地区分作为尺度或环境的函数调节增长率的修正重力情景,并测试同质性和各向同性的基本假设。

英文摘要:

We present a new test of gravitational physics by comparing the growth rate of cosmic structure measured around voids with that measured around galaxies in the same large-scale structure dataset, the low-redshift 6-degree Field Galaxy Survey. By fitting a self-consistent Redshift Space Distortion model to the 2D galaxy-galaxy and void-galaxy correlation functions, we recover growth rate values fσ_8 = 0.42 \pm 0.06 and 0.39 \pm 0.11, respectively. The environmental-dependence of cosmological statistics can potentially discriminate between modified-gravity scenarios which modulate the growth rate as a function of scale or environment and test the underlying assumptions of homogeneity and isotropy.

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。

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