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arXiv · 2007.04656

Constraining the growth rate by combining multiple future surveys

Jan-Albert Viljoen·José Fonseca·Roy Maartens
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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 $\gamma$ improves on the best single-tracer precision by up to $\sim$50\%.

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Jan-Albert Viljoen, José Fonseca, Roy Maartens. 2020-07-09. Constraining the growth rate by combining multiple future surveys. https://doi.org/10.1088/1475-7516/2020/09/054

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