Cosmic shear with small scales: DES-Y3, KiDS-1000 and HSC-DR1
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| Format: | Preprint |
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2024
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| author | García-García, Carlos Zennaro, Matteo Aricò, Giovanni Alonso, David Angulo, Raul E. |
| author_facet | García-García, Carlos Zennaro, Matteo Aricò, Giovanni Alonso, David Angulo, Raul E. |
| contents | 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 $\ell_{\rm max}=4500$, corresponding to significantly smaller scales ($δθ\sim2.4'$) 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 $S_8\equivσ_8\sqrt{Ω_{\rm m}/0.3}=0.795^{+0.015}_{-0.017}$, in relatively good agreement with CMB constraints from Planck (less than $\sim1.8σ$ tension), although we obtain a low value of $Ω_{\rm m}=0.212^{+0.017}_{-0.032}$, in tension with Planck at the $\sim3σ$ 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 $\ell\lesssim2000$ 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 |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_13794 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Cosmic shear with small scales: DES-Y3, KiDS-1000 and HSC-DR1 García-García, Carlos Zennaro, Matteo Aricò, Giovanni Alonso, David Angulo, Raul E. Cosmology and Nongalactic Astrophysics 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 $\ell_{\rm max}=4500$, corresponding to significantly smaller scales ($δθ\sim2.4'$) 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 $S_8\equivσ_8\sqrt{Ω_{\rm m}/0.3}=0.795^{+0.015}_{-0.017}$, in relatively good agreement with CMB constraints from Planck (less than $\sim1.8σ$ tension), although we obtain a low value of $Ω_{\rm m}=0.212^{+0.017}_{-0.032}$, in tension with Planck at the $\sim3σ$ 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 $\ell\lesssim2000$ 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 |
| title | Cosmic shear with small scales: DES-Y3, KiDS-1000 and HSC-DR1 |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2403.13794 |