Measurement of gravitational lensing of the cosmic microwave background using SPT-3G 2018 data

Z. Pan, F. Bianchini, W. L.K. Wu, P. A.R. Ade, Z. Ahmed, E. Anderes, A. J. Anderson, B. Ansarinejad, M. Archipley, K. Aylor, L. Balkenhol, P. S. Barry, R. Basu Thakur, K. Benabed, A. N. Bender, B. A. Benson, L. E. Bleem, F. R. Bouchet, L. Bryant, K. ByrumE. Camphuis, J. E. Carlstrom, F. W. Carter, T. W. Cecil, C. L. Chang, P. Chaubal, G. Chen, P. M. Chichura, H. M. Cho, T. L. Chou, J. F. Cliche, A. Coerver, T. M. Crawford, A. Cukierman, C. Daley, T. De Haan, E. V. Denison, K. R. Dibert, J. Ding, M. A. Dobbs, A. Doussot, D. Dutcher, W. Everett, C. Feng, K. R. Ferguson, K. Fichman, A. Foster, J. Fu, S. Galli, A. E. Gambrel, R. W. Gardner, F. Ge, N. Goeckner-Wald, R. Gualtieri, F. Guidi, S. Guns, N. Gupta, N. W. Halverson, A. H. Harke-Hosemann, N. L. Harrington, J. W. Henning, G. C. Hilton, E. Hivon, G. P. Holder, W. L. Holzapfel, J. C. Hood, D. Howe, N. Huang, K. D. Irwin, O. Jeong, M. Jonas, A. Jones, F. Kéruzoré, T. S. Khaire, L. Knox, A. M. Kofman, M. Korman, D. L. Kubik, S. Kuhlmann, C. L. Kuo, A. T. Lee, E. M. Leitch, K. Levy, A. E. Lowitz, C. Lu, A. Maniyar, F. Menanteau, S. S. Meyer, D. Michalik, M. Millea, J. Montgomery, A. Nadolski, Y. Nakato, T. Natoli, H. Nguyen, G. I. Noble, V. Novosad, Y. Omori, S. Padin, P. Paschos, J. Pearson, C. M. Posada, K. Prabhu, W. Quan, S. Raghunathan, M. Rahimi, A. Rahlin, C. L. Reichardt, D. Riebel, B. Riedel, J. E. Ruhl, J. T. Sayre, E. Schiappucci, E. Shirokoff, G. Smecher, J. A. Sobrin, A. A. Stark, J. Stephen, K. T. Story, A. Suzuki, S. Takakura, C. Tandoi, K. L. Thompson, B. Thorne, C. Trendafilova, C. Tucker, C. Umilta, L. R. Vale, K. Vanderlinde, J. D. Vieira, G. Wang, N. Whitehorn, V. Yefremenko, K. W. Yoon, M. R. Young, J. A. Zebrowski

Research output: Contribution to journalArticlepeer-review


We present a measurement of gravitational lensing over 1500 deg2 of the Southern sky using SPT-3G temperature data at 95 GHz and 150 GHz taken in 2018. The lensing amplitude relative to a fiducial Planck 2018 Lambda cold dark matter (ΛCDM) cosmology is found to be 1.020±0.060, excluding instrumental and astrophysical systematic uncertainties. We conduct extensive systematic and null tests to check the robustness of the lensing measurements, and report a minimum-variance combined lensing power spectrum over angular multipoles of 50<L<2000, which we use to constrain cosmological models. When analyzed alone and jointly with primary cosmic microwave background (CMB) spectra within the ΛCDM model, our lensing amplitude measurements are consistent with measurements from SPT-SZ, SPTpol, ACT, and Planck. Incorporating loose priors on the baryon density and other parameters including uncertainties on a foreground bias template, we obtain a 1σ constraint on σ8ωm0.25=0.595±0.026 using the SPT-3G 2018 lensing data alone, where σ8 is a common measure of the amplitude of structure today and ωm is the matter density parameter. Combining SPT-3G 2018 lensing measurements with baryon acoustic oscillation (BAO) data, we derive parameter constraints of σ8=0.810±0.033, S8σ8(ωm/0.3)0.5=0.836±0.039, and Hubble constant H0=68.8-1.6+1.3 km s-1 Mpc-1. Our preferred S8 value is higher by 1.6 to 1.8σ compared to cosmic shear measurements from DES-Y3, HSC-Y3, and KiDS-1000 at lower redshift and smaller scales. We combine our lensing data with CMB anisotropy measurements from both SPT-3G and Planck to constrain extensions of ΛCDM. Using CMB anisotropy and lensing measurements from SPT-3G only, we provide independent constraints on the spatial curvature of ωK=0.014-0.026+0.023 (95% C.L.) and the dark energy density of ωΛ=0.722-0.026+0.031 (68% C.L.). When combining SPT-3G lensing data with SPT-3G CMB anisotropy and BAO data, we find an upper limit on the sum of the neutrino masses of mν<0.30 eV (95% C.L.). Due to the different combination of angular scales and sky area, this lensing analysis provides an independent check on lensing measurements by ACT and Planck.

Original languageEnglish (US)
Article number122005
JournalPhysical Review D
Issue number12
StatePublished - Dec 15 2023

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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