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

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Abstract

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 ƒ σ 8 = 0.42 ± 0.06 and 0.39 ± 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.
Original languageEnglish
JournalPhysical Review D
Volume95
Issue number8
DOIs
Publication statusPublished - 4 Apr 2017

Keywords

  • astro-ph.CO

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