The Atacama Cosmology Telescope: A Measurement of the DR6 CMB Lensing Power Spectrum and Its Implications for Structure Growth

Abstract We present new measurements of cosmic microwave background (CMB) lensing over 9400 deg 2 of the sky. These lensing measurements are derived from the Atacama Cosmology Telescope (ACT) Data Release 6 (DR6) CMB data set, which consists of five seasons of ACT CMB temperature and polarization observations. We determine the amplitude of the CMB lensing power spectrum at 2.3% precision (43 σ significance) using a novel pipeline that minimizes sensitivity to foregrounds and to noise properties. To ensure that our results are robust, we analyze an extensive set of null tests, consistency tests, and systematic error estimates and employ a blinded analysis framework. Our CMB lensing power spectrum measurement…

• NS
  National Science Foundation

  Awards: AST-1440226, AST-2108536, 2108536, AST-1907657, 1214379, 2039656, PHY-0855887, 0355328, 21-ATP21-0145, 1907657, 0408698, DE-AC02-07CH11359, FB210003, AST-0408698, PHY-1214379, 0855887, DE-AC02-05CH11231, 2108126, 0965625, AST-2108126
• UD
  U.S. Department of Energy

  Awards: -AC02-05CH11231, DE-AC02-07CH11359, DE-SC00233966, 05CH11231, AC02-07CH11359, AC02-05CH11231, DE-AC02, DE-AC02-05CH11231, DE-AC02-
• NA
  National Aeronautics and Space Administration

  Awards: DE-AC02-05CH11231, FB210003, NNX14AB58G, NNX13AE56G, 21-ATP21-0145, 22-ADAP22-0145, 21-ATP21-0129
• AP
  Alfred P. Sloan Foundation

  Award: DE-AC02-05CH11231
• PU
  Princeton University
• UO
  University of Pennsylvania
• CC
  Compute Canada
• GO
  Government of Ontario
• NE
  National Energy Research Scientific Computing Center

  Awards: 05CH11231, HEP-ERCAPmp107, AC02-05CH11231
• GO
  Government of Canada
• EC
  European Commission

  Awards: DE-AC02-05CH11231, 849169, 851274
• NR
  National Research Foundation

  Award: 137975
• MO
  Ministry of Education, Culture, Sports, Science and Technology

  Award: DE-AC02-05CH11231
• SN
  Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung

  Award: 186879
• IC
  Industry Canada
• CT
  Cambridge Trust
• UO
  University of Toronto
• AN
  Agencia Nacional de Investigación y Desarrollo

  Awards: 11191125, FB210003
• IP
  Institut Périmètre de physique théorique
• MO
  Ministry of Colleges and Universities
• NI
  National Institute of Standards and Technology

  Award: DE-AC02-05CH11231
• OO
  Office of Science

  Awards: AC02-05CH11231, -AC02-05CH11231, DE-AC02, DE-AC02-07CH11359
• SA
  Science and Technology Facilities Council

  Awards: ST/S002545/1, ST/R001014/1, ST/V002376/1, ST/N000927/1, DE-AC02-07CH11359, ST/T001348/1, ST/X000311/1, ST/X005623/1, ST/X000303/1, ST/W002787/1, ST/X005577/1, ST/N000927/1, ST/M006948/1, ST/W002701/1, ST/T001569/1, ST/R000832/1, ST/V002384/1, ST/W002728/1, ST/S003762/1, ST/X000117/1, ST/T001372/1, ST/W000830/1, ST/X000265/1, ST/W002760/1, ST/S000623/1, ST/S003916/1, ST/X000079/1, ST/X006387/1, ST/X005542/1, ST/R001049/1, ST/X006387/1
• JS
  Japan Society for the Promotion of Science

  Awards: JP22K03682, JP20H05859
• HE
  High Energy Physics

  Award: DE-AC02-05CH11231
• LB
  Lawrence Berkeley National Laboratory

  Awards: DE-AC02-05CH11231, DE-AC02-07CH11359, 05CH11231, AC02-05CH11231