Kavli Affiliate: Bradford A. Benson
| First 5 Authors: Frank J. Qu, Fei Ge, W. L. Kimmy Wu, Irene Abril-Cabezas, Mathew S. Madhavacheril
| 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
textit{Planck}. 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 $A_mathrm{lens}^mathrm{recon} = 1.025 pm
0.017$ with respect to the theory prediction from the best-fit CMB
textit{Planck}-ACT cosmology. The bandpowers from all three lensing datasets,
analyzed jointly, yield a $1.6%$ measurement of the parameter combination
$S_8^mathrm{CMBL} equiv sigma_8,(Omega_m/0.3)^{0.25} =
0.825^{+0.015}_{-0.013}$. Including Dark Energy Spectroscopic Instrument (DESI)
Baryon Acoustic Oscillation (BAO) data improves the constraint on the amplitude
of matter fluctuations to $sigma_8 = 0.829 pm 0.009$ (a $1.1%$
determination). When combining with uncalibrated supernovae from
texttt{Pantheon+}, we present a $4%$ sound-horizon-independent estimate of
$H_0=66.4pm2.5,mathrm{km,s^{-1},Mpc^{-1}} $. The joint lensing constraints
on structure growth and present-day Hubble rate are fully consistent with a
$Lambda$CDM model fit to the primary CMB data from textit{Planck} 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
$Lambdamathrm{CDM}$ 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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