%ALange, Johannes%AHearin, Andrew%ALeauthaud, Alexie%Avan den Bosch, Frank%AXhakaj, Enia%AGuo, Hong%AWechsler, Risa%ADeRose, Joseph%BJournal Name: Monthly Notices of the Royal Astronomical Society; Journal Volume: 520; Journal Issue: 4; Related Information: CHORUS Timestamp: 2024-02-16 17:30:49 %D2023%IOxford University Press %JJournal Name: Monthly Notices of the Royal Astronomical Society; Journal Volume: 520; Journal Issue: 4; Related Information: CHORUS Timestamp: 2024-02-16 17:30:49 %K %MOSTI ID: 10398768 %PMedium: X; Size: p. 5373-5393 %TConstraints on S 8 from a full-scale and full-shape analysis of redshift-space clustering and galaxy–galaxy lensing in BOSS %XABSTRACT

We present a novel simulation-based cosmological analysis of galaxy–galaxy lensing and galaxy redshift-space clustering. Compared to analysis methods based on perturbation theory, our simulation-based approach allows us to probe a much wider range of scales, $0.4 \, h^{-1} \, \mathrm{Mpc}$ to $63 \, h^{-1} \, \mathrm{Mpc}$, including highly non-linear scales, and marginalizes over astrophysical effects such as assembly bias. We apply this framework to data from the Baryon Oscillation Spectroscopic Survey LOWZ sample cross-correlated with state-of-the-art gravitational lensing catalogues from the Kilo Degree Survey and the Dark Energy Survey. We show that gravitational lensing and redshift-space clustering when analysed over a large range of scales place tight constraints on the growth-of-structure parameter $S_8 = \sigma _8 \sqrt{\Omega _{\rm m} / 0.3}$. Overall, we infer S8 = 0.792 ± 0.022 when analysing the combination of galaxy–galaxy lensing and projected galaxy clustering and S8 = 0.771 ± 0.027 for galaxy redshift-space clustering. These findings highlight the potential constraining power of full-scale studies over studies analysing only large scales and also showcase the benefits of analysing multiple large-scale structure surveys jointly. Our inferred values for S8 fall below the value inferred from the CMB, S8 = 0.834 ± 0.016. While this difference is not statistically significant by itself, our results mirror other findings in the literature whereby low-redshift large-scale structure probes infer lower values for S8 than the CMB, the so-called S8-tension.

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