CosmoVerse@Krakow: Daniela Grandón: Impact of baryons on cosmological parameters

This series is the recording of the CosmoVerse@Krakow conference that happened between 9 and 11 July 2024.

Daniela Grandón:
The impact of baryons on cosmological parameters from HSC Y1 non-Gaussian statistics

We present cosmological constraints derived from lensing peak counts, minimum counts, one-point PDF and the angular power spectrum of the Subaru Hyper Suprime-Cam first-year (HSC Y1) weak lensing shear catalog. These summary statistics contain non-
Gaussian information and hence are complementary to the conventional two-point statistics in constraining cosmology. In this
work, we forward-model the 'non-Gaussian statistics' and their dependence on cosmology, using a suite of 𝑁-body simulations
tailored to the HSC Y1 data. We also investigate the impact of baryons on the lensing non-Gaussian statistics and the resulting biases in the matter clustering amplitude S8 =σ8 sqrt(Ωm/0.3), when the smallest scales are included. We find up to 1σ bias in S8 when the smallest scales (2 arcmin) and the highest feedback level are considered. Our results indicate no tension between the S8 inferred from HSC
Y1 lensing and from CMB measurements, such as Planck 2018 and recent CMB lensing constraints from the Atacama Cosmology Telescope and the South Pole Telescope.

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