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

Journal Article · · The Astrophysical Journal
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  1. University of Pennsylvania, Philadelphia, PA (United States); Perimeter Institute for Theoretical Physics, Waterloo (Canada); et al.

We present cosmological constraints from a gravitational lensing mass map covering 9400 deg2 reconstructed from measurements of the cosmic microwave background (CMB) made by the Atacama Cosmology Telescope (ACT) from 2017 to 2021. In combination with measurements of baryon acoustic oscillations and big bang nucleosynthesis, we obtain the clustering amplitude σ8 = 0.819 ± 0.015 at 1.8% precision, S8 ≡ σ8m/0.3)0.5 = 0.840 ± 0.028, and the Hubble constant H0 = (68.3 ± 1.1) km s-1 Mpc-1 at 1.6% precision. A joint constraint with Planck CMB lensing yields σ8 = 0.812 ± 0.013, S8 ≡ σ8m/0.3)0.5 = 0.831 ± 0.023 , and H0 = (68.1 ± 1.0) km s-1 Mpc-1. These measurements agree with ΛCDM extrapolations from the CMB anisotropies measured by Planck. We revisit constraints from the KiDS, DES, and HSC galaxy surveys with a uniform set of assumptions and find that S8 from all three are lower than that from ACT+Planck lensing by levels ranging from 1.7σ to 2.1σ. This motivates further measurements and comparison, not just between the CMB anisotropies and galaxy lensing but also between CMB lensing probing z ~ 0.5–5 on mostly linear scales and galaxy lensing at z 0.5 on smaller scales. We combine with CMB anisotropies to constrain extensions of ΛCDM, limiting neutrino masses to Σmν < 0.13 eV (95% c.l.), for example. We describe the mass map and related data products that will enable a wide array of cross-correlation science. Our results provide independent confirmation that the universe is spatially flat, conforms with general relativity, and is described remarkably well by the ΛCDM model, while paving a promising path for neutrino physics with lensing from upcoming ground-based CMB surveys.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
ACT
Grant/Contract Number:
AC02-05CH11231; AC02-07CH11359
OSTI ID:
1973616
Report Number(s):
FERMILAB-PUB--23-206-PPD; arXiv:2304.05203; oai:inspirehep.net:2650496
Journal Information:
The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 962; ISSN 0004-637X
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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