Year: 2026
Type: preprint
Abstract: We present a map of the cosmic microwave background (CMB) lensing potential reconstructed from observations taken during the 2019 and 2020 seasons with the third-generation camera on the South Pole Telescope (SPT), covering the $1500\,{\rm deg}^{2}$ SPT-3G Main field, referred to as the SPT-3G D1 dataset. From the multi-frequency temperature and polarization data, we reconstruct the CMB lensing field using a quadratic estimator that jointly accounts for the $T$, $E$, and $B$ fields and their covariance. The resulting lensing map is dominated by polarization information for $L \lesssim 600$ and provides the highest signal-to-noise measurement per mode reported to date. With nuisance parameters fixed to their best-fit values, we measure a lensing amplitude consistent with unity at $2\%$ precision relative to the $Λ$CDM model that best fits the combined Planck, ACT DR6, and SPT-3G D1 $TT/TE/EE$ likelihoods (${\rm CMB}_{\rm SPA}$). We further measure the structure-growth parameter $σ_{8}Ω_{\rm m}^{0.25}$ to be $0.6046\pm0.0096$ from the SPT-3G D1 lensing spectrum alone and $0.6020\pm0.0084$ when combined with ACT DR6 and Planck PR4 CMB lensing. By further combining this with ${\rm CMB}_{\rm SPA}$ and the latest DESI DR2 BAO data, we obtain $\sum m_ν < 0.072\,\mathrm{eV}$ (95% C.L.) when allowing the neutrino mass to vary within $Λ$CDM. Compared with previous work, the better agreement of our measurement with DESI DR2 BAO yields both this relaxed upper bound and reduced ($\mathord{\sim}2σ$) preferences for nonzero spatial curvature and for deviations of $(w_0,w_a)$ from the $Λ$CDM expectation. When we combine CMB lensing with the DES Y3 3$\times$2pt analysis, we obtain $S_{8}=0.811\pm0.011$, corresponding to a $1.4\%$ constraint on the late-time clustering amplitude. This precision is competitive with that obtained from the primary CMB within $Λ$CDM.
Source: arXiv (Cornell University)
Authors: Omori, Y., Wu, W. L. K., Nakato, Y., Bianchini, F., Balkenhol, L., Daley, C., Quan, W., Anderes, E., Anderson, A. J., Ansarinejad, B., Archipley, M., Barron, D. R., Barry, P. S., Benabed, K., Bender, A. N., Benson, B. A., Bleem, L. E., Bocquet, S., Bouchet, F. R., Camphuis, E., Campitiello, M. G., Carlstrom, J. E., Carron, J., Chang, C. L., Chichura, P. M., Chokshi, A., Chou, T. -L., Coerver, A., Crawford, T. M., de Haan, T., Dibert, K. R., Dobbs, M. A., Doohan, M., Dutcher, D., Feng, C., Ferguson, K. R., Ferree, N. C., Fichman, K., Foster, A., Galli, S., Gambrel, A. E., Gao, A. K., Ge, F., Guidi, F., Guns, S., Halverson, N. W., Hivon, E., Holder, G. P., Holzapfel, W. L., Hood, J. C., Hryciuk, A., Huang, N., Jhaveri, T., Kéruzoré, F., Khalife, A. R., Knox, L., Kornoelje, K., Kuo, C. -L., Levy, K., Li, Y., Lowitz, A. E., Lu, C., Lynch, G. P., Maccarone, T. J., Maniyar, A. S., Martsen, E. S., Menanteau, F., Millea, M., Montgomery, J., Natoli, T., Ouellette, A., Pan, Z., Paschos, P., Phadke, K. A., Pollak, A. W., Prabhu, K., Rahimi, M., Rahlin, A., Reichardt, C. L., Rouble, M., Ruhl, J. E., Oliveira, A. C. Silva, Simpson, A., Sobrin, J. A., Stark, A. A., Stephen, J., Tandoi, C., Trendafilova, C., Vieira, J. D., Vieregg, A. G., Vitrier, A., Wan, Y., Whitehorn, N., Young, M. R., Zebrowski, J. A.
Institutions: Stanford University, Centre National de la Recherche Scientifique, Institut d'Astrophysique de Paris, Sorbonne Université, University of Illinois Urbana-Champaign, Université Paris Cité, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, Astrophysique, Instrumentation et Modélisation, University of California, Davis, The University of Melbourne, University of Chicago, University of New Mexico, Cardiff University, Ludwig-Maximilians-Universität München, Argonne National Laboratory, University of Geneva, Istituto Ricerche Solari Locarno, Università della Svizzera italiana, University of California, Berkeley, High Energy Accelerator Research Organization, Canadian Institute for Advanced Research, Trottier Space Institute at McGill, McGill University, University of California, Los Angeles, Michigan State University, University of Colorado Boulder, Texas Tech University, National Center for Supercomputing Applications, Case Western Reserve University, Fermi National Accelerator Laboratory, Villanova University, Center for Astrophysics Harvard & Smithsonian
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G102163711, G1055550527, G107546177, G1313983767, G1664757510, G2011917337, G2287611682, G2376186588, G262962599, G3075337988, G4269941704, G498139845, G513797252, G5560389312, G6256534168, G6471802762, G6868755465, G6918803902, South Pole Telescope Operations and Data Products, G8581667079, South Pole Telescope Operations and Data Products, G8755702448, G993149817
OpenAlex ID: W7204958121