Kavli Affiliate: Anthony Challinor
| Summary:
We present the tightest cosmic microwave background (CMB) lensing constraints to date on the growth of structure by combining CMB lensing measurements from the Atacama Cosmology Telescope (ACT), the South Pole Telescope (SPT) and textitPlanck. Each of these surveys individually provides lensing measurements with similarly high statistical power, achieving signal-to-noise ratios of approximately 40. The combined lensing bandpowers represent the most precise CMB lensing power spectrum measurement to date with a signal-to-noise ratio of 61 and an amplitude of $A_mathrmlens^mathrmrecon = 1.025 pm 0.017$ with respect to the theory prediction from the best-fit CMB textitPlanck-ACT cosmology. The bandpowers from all three lensing datasets, analyzed jointly, yield a $1.6%$ measurement of the parameter combination $S_8^mathrmCMBL equiv σ_8,(Ω_m/0.3)^0.25 = 0.825^+0.015_-0.013$. Including Dark Energy Spectroscopic Instrument (DESI) Baryon Acoustic Oscillation (BAO) data improves the constraint on the amplitude of matter fluctuations to $σ_8 = 0.829 pm 0.009$ (a $1.1%$ determination). When combining with uncalibrated supernovae from textttPantheon+, we present a $4%$ sound-horizon-independent estimate of $H_0=66.4pm2.5,mathrmkm,s^-1,Mpc^-1 $. The joint lensing constraints on structure growth and present-day Hubble rate are fully consistent with a $Λ$CDM model fit to the primary CMB data from textitPlanck and ACT. While the precise upper limit is sensitive to the choice of data and underlying model assumptions, when varying the neutrino mass sum within the $ΛmathrmCDM$ cosmological model, the combination of primary CMB, BAO and CMB lensing drives the probable upper limit for the mass sum towards lower values, comparable to the minimum mass prior required by neutrino oscillation experiments.
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