The Atacama Cosmology Telescope: DR6 Gravitational Lensing Map and Cosmological Parameters

Understand

We present cosmological constraints from a gravitational lensing mass map covering 9400 sq.

• deg.
• reconstructed from CMB measurements made by the Atacama Cosmology Telescope (ACT) from 2017 to 2021.
• In combination with BAO measurements (from SDSS and 6dF), we obtain the amplitude of matter fluctuations $\sigma_8 = 0.819 \pm 0.015$ at 1.8% precision, $S_8\equiv\sigma_8({\Omega_{\rm m}}/0.3)^{0.5}=0.840\pm0.028$ and the Hubble constant $H_0= (68.3 \pm 1.1)\, \text{km}\,\text{s}^{-1}\,\text{Mpc}^{-1}$ at 1.6% precision.