PT challenge: Validation of ShapeFit on large-volume, high-resolution mocks

Abstract

The ShapeFit compression method has been shown to be a powerful tool to gain cosmological information from galaxy power spectra in an effective, model-independent way. Here we present its performance on the blind PT challenge mock products presented in [1]. Choosing a set-up similar to that of other participants to the blind challenge we obtained $\Delta \ln \left(10^{10}{A}_s\right)=-0.018\pm 0.014$, $\Delta {\Omega }_{\mathrm{m}}=0.0039\pm 0.0021$ and $\Delta h=-0.0009\pm 0.0034$, remaining below $2\sigma$ deviations for a volume of $566{\left[h^{-1}\mathrm{Gpc}\right]}^3$. This corresponds to a volume 10 times larger than the volume probed by future galaxy surveys. We also present an analysis of these mocks oriented towards an actual data analysis using the full redshift evolution, using all three redshift bins $z_1=0.38$, $z_2=0.51$, and $z_3=0.61$, and exploring different set-ups to quantify the impact of choices or assumptions on noise, bias, scale range, etc. We find consistency across reasonable changes in set-up and across redshifts and that, as expected, mapping the redshift evolution of clustering helps constraining cosmological parameters within a given model.

27 pages, 9 figures, 3 tables, v2 matches accepted version. The minor changes wrt v1 are mostly related to a small correction post-unblinding mildly affecting the DATA-like cases

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• A tale of two (or more) $h$'s
• Fisher matrix for the one-loop galaxy power spectrum: measuring expansion and growth rates without assuming a cosmological model
• Model-agnostic interpretation of 10 billion years of cosmic evolution traced by BOSS and eBOSS data