The Digital Press

The combined cosmic microwave background (CMB) lensing data from ACT, SPT, and Planck provide the most precise measurement yet of cosmic structure growth and the Hubble constant, reinforcing the standard cosmological model.

Why it matters: This tightest CMB lensing constraint sharpens our understanding of matter clustering and cosmic expansion.

The big picture: Joint datasets achieve a 1.6% precision on $S8$ and improve $\sigma8$ determination to 1.1% with added BAO data.

Stunning stat: The combined lensing signal-to-noise ratio reaches 61, surpassing individual survey capabilities around 40.

The stakes: These results narrow neutrino mass sum limits, approaching the minimum values required by neutrino oscillation measurements.