Kavli Affiliate: Hiroaki Aihara
| Summary:
We present the first measurement of cross-correlation between the lensing potential, reconstructed from cosmic microwave background (CMB) it polarization data, and the cosmic shear field from galaxy shapes. This measurement is made using data from the POLARBEAR CMB experiment and the Subaru Hyper Suprime-Cam (HSC) survey. By analyzing an 11~deg$^2$ overlapping region, we reject the null hypothesis at 3.5$σ$ and constrain the amplitude of the bf cross-spectrum to $widehatA_rm lens=1.70pm 0.48$, where $widehatA_rm lens$ is the amplitude normalized with respect to the Planck~2018 prediction, based on the flat $Λ$ cold dark matter cosmology. The first measurement of this bf cross-spectrum without relying on CMB temperature measurements is possible due to the deep POLARBEAR map with a noise level of $sim$6,$μ$K-arcmin, as well as the deep HSC data with a high galaxy number density of $n_g=23,rm arcmin^-2$. We present a detailed study of the systematics budget to show that residual systematics in our results are negligibly small, which demonstrates the future potential of this cross-correlation technique.
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