Constraining the growth rate by combining multiple future surveys
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Date
2020
Journal Title
Journal ISSN
Volume Title
Publisher
IOP Publishing
Abstract
The growth rate of large-scale structure provides a powerful consistency test of
the standard cosmological model and a probe of possible deviations from general relativity.
We use a Fisher analysis to forecast constraints on the growth rate from a combination of
next-generation spectroscopic surveys. In the overlap survey volumes, we use a multi-tracer
analysis to significantly reduce the effect of cosmic variance. The non-overlap individual
survey volumes are included in the Fisher analysis in order to utilise the entire volume. We
use the observed angular power spectrum, which naturally includes all wide-angle and lensing
effects and circumvents the need for an Alcock-Paczynski correction. Cross correlations
between redshift bins are included by using a novel technique to avoid computation of the
sub-dominant contributions. Marginalising over the standard cosmological parameters, as
well as the clustering bias in each redshift bin, we find that the precision on γ improves on
the best single-tracer precision by up to ∼50%
Description
Keywords
Dark energy experiments, Gravity, Modified gravity, Galaxy surveys, Growth rate
Citation
Viljoen, J. A. et al. (2020). Constraining the growth rate by combining multiple future surveys. Journal of Cosmology and Astroparticle Physics, 2020(09)