Cosmic shear with small scales: DES-Y3, KiDS-1000 and HSC-DR1

Abstract

We present a cosmological analysis of the combination of the DES-Y3, KiDS-1000 and HSC-DR1 weak lensing samples under a joint harmonic-space pipeline making use of angular scales down to ${\ell }_{\max }=4500$, corresponding to significantly smaller scales ($\delta \theta \sim 2.4^{\prime }$) than those commonly used in cosmological weak lensing studies. We are able to do so by accurately modelling non-linearities and the impact of baryonic effects using Baccoemu. We find $S_8\equiv {\sigma }_8\sqrt{{\Omega }_{\mathrm{m}}/0.3}=0.795_{-0.017}^{+0.015}$, in relatively good agreement with CMB constraints from Planck (less than $\sim 1.8\sigma$ tension), although we obtain a low value of ${\Omega }_{\mathrm{m}}=0.212_{-0.032}^{+0.017}$, in tension with Planck at the $\sim 3\sigma$ level. We show that this can be recast as an $H_0$ tension if one parametrises the amplitude of fluctuations and matter abundance in terms of variables without hidden dependence on $H_0$. Furthermore, we find that this tension reduces significantly after including a prior on the distance-redshift relationship from BAO data, without worsening the fit. In terms of baryonic effects, we show that failing to model and marginalise over them on scales $\ell \lesssim 2000$ does not significantly affect the posterior constraints for DES-Y3 and KiDS-1000, but has a mild effect on deeper samples, such as HSC-DR1. This is in agreement with our ability to only mildly constrain the parameters of the Baryon Correction Model with these data

v1: 57 pages, 24 figures, comments welcome. v2: accepted version in JCAP

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