Consistency of the growth rate in different environments with the 6-degree Field Galaxy Survey: Measurement of the void-galaxy and galaxy-galaxy correlation functions

Jun 9, 2016
11 pages
Published in:
  • Phys.Rev.D 95 (2017) 8, 083502
  • Published: Apr 4, 2017
e-Print:

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Abstract: (APS)
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 data set: the low-redshift 6-degree Field Galaxy Survey. By fitting a redshift space distortion model to the two-dimensional galaxy-galaxy and void-galaxy correlation functions, we recover the growth rate values fσ8=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.
Note:
  • 12 pages, 4 figures, accepted in PRD