A Measurement of Gravitational Lensing of the Cosmic Microwave Background Using SPT-3G 2018 Data

• Main Authors: Pan, Z, Bianchini, F, Wu, W. L. K, Ahmed, Z, Anderes, E, Anderson, A. J, Ansarinejad, B, Aylor, K, Balkenhol, L, Barry, P. S, Benabed, K, Bender, A. N, Benson, B. A, Bleem, L. E, Bouchet, F. R, Bryant, L, Byrum, K, Carlstrom, J. E, Carter, F. W, Cecil, T. W, Chang, C. L, Chaubal, P, Chen, G, Cho, H. -M, Chou, T. -L, Cliche, J. -F, Coerver, A, Cukierman, A, Daley, C, de Haan, T, Denison, E. V, Dibert, K. R, Doussot, A, Dutcher, D, Feng, C, Ferguson, K. R, Fichman, K, Foster, A, Galli, S, Gambrel, A. E, Ge, F, Goeckner-Wald, N, Gualtieri, R, Guns, S, Gupta, N, Halverson, N. W, Harke-Hosemann, A. H, Harrington, N. L, Henning, J. W, Hivon, E, Holzapfel, W. L, Howe, D, Jeong, O, Kéruzoré, F, Khaire, T. S, Knox, L, Kofman, A. M, Korman, M, Kubik, D. L, Kuhlmann, S, Kuo, C. -L, Lee, A. T, Leitch, E. M, Lowitz, A. E, Maniyar, A, Meyer, S. S, Michalik, D, Millea, M, Nadolski, A, Nakato, Y, Natoli, T, Nguyen, H, Noble, G. I, Omori, Y, Padin, S, Paschos, P, Pearson, J, Posada, C. M, Prabhu, K, Quan, W, Raghunathan, S, Rahimi, M, Rahlin, A, Reichardt, C. L, Riebel, D, Riedel, B, Sayre, J. T, Shirokoff, E, Sobrin, J. A, Story, K. T, Suzuki, A, Takakura, S, Tandoi, C, Thompson, K. L, Thorne, B, Trendafilova, C, Tucker, C, Umilta, C, Vale, L. R, Wang, G
• Format: Journal Article
• Language: English
• Published: 29-01-2024
• Subjects: Physics - Cosmology and Nongalactic Astrophysics
• DOI: 10.48550/arxiv.2308.11608

Physical Review D 108.12 (2023): 122005 We present a measurement of gravitational lensing over 1500 deg$^2$ of the
Southern sky using SPT-3G temperature data at 95 and 150 GHz taken in 2018. The
lensing amplitude relative to a fiducial Planck 2018 $\Lambda$CDM cosmology is
found to be $1.020\pm0.060$, 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 $\Lambda$CDM
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 $1\sigma$ constraint on $\sigma_8 \Omega_{\rm
m}^{0.25}=0.595 \pm 0.026$ using the SPT-3G 2018 lensing data alone, where
$\sigma_8$ is a common measure of the amplitude of structure today and
$\Omega_{\rm m}$ is the matter density parameter. Combining SPT-3G 2018 lensing
measurements with baryon acoustic oscillation (BAO) data, we derive parameter
constraints of $\sigma_8 = 0.810 \pm 0.033$, $S_8 \equiv \sigma_8(\Omega_{\rm
m}/0.3)^{0.5}= 0.836 \pm 0.039$, and Hubble constant $H_0 =68.8^{+1.3}_{-1.6}$
km s$^{-1}$ Mpc$^{-1}$. Using CMB anisotropy and lensing measurements from
SPT-3G only, we provide independent constraints on the spatial curvature of
$\Omega_{K} = 0.014^{+0.023}_{-0.026}$ (95% C.L.) and the dark energy density
of $\Omega_\Lambda = 0.722^{+0.031}_{-0.026}$ (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 $\sum m_{\nu}< 0.30$ eV (95% C.L.).