SPT-3G D1: Quadratic-Estimator CMB Lensing Reconstruction and Cosmology

@misc{omori2026spt3g,
  title = {{SPT-3G D1: Quadratic-Estimator CMB Lensing Reconstruction and Cosmology}},
  author = {Y Omori and W.L.K Wu and Y Nakato and F Bianchini and L Balkenhol and C Daley and W Quan and E Anderes and A.J Anderson and B Ansarinejad and M Archipley and D.R Barron and P.S Barry and K Benabed and A.N Bender and B.A Benson and L.E Bleem and S Bocquet and F.R Bouchet and E Camphuis and M.G Campitiello and J.E Carlstrom and J Carron and C.L Chang and P.M Chichura and A Chokshi and T.-L Chou and A Coerver and T.M Crawford and T de Haan and K.R Dibert and M.A Dobbs and M Doohan and D Dutcher and C Feng and K.R Ferguson and N.C Ferree and K Fichman and A Foster and S Galli and A.E Gambrel and A.K Gao and F Ge and F Guidi and S Guns and N.W Halverson and E Hivon and G.P Holder and W.L Holzapfel and J.C Hood and A Hryciuk and N Huang and T Jhaveri and F Kéruzoré and A.R Khalife and L Knox and K Kornoelje and C.-L Kuo and K Levy and Y Li},
  howpublished = {HAL},
  year = {2026},
  month = aug,
  doi = {10.48550/arxiv.2608.31136},
  eprint = {2608.31136},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05742669v1},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - SPT-3G D1: Quadratic-Estimator CMB Lensing Reconstruction and Cosmology
AU  - Y Omori
AU  - W.L.K Wu
AU  - Y Nakato
AU  - F Bianchini
AU  - L Balkenhol
AU  - C Daley
AU  - W Quan
AU  - E Anderes
AU  - A.J Anderson
AU  - B Ansarinejad
AU  - M Archipley
AU  - D.R Barron
AU  - P.S Barry
AU  - K Benabed
AU  - A.N Bender
AU  - B.A Benson
AU  - L.E Bleem
AU  - S Bocquet
AU  - F.R Bouchet
AU  - E Camphuis
AU  - M.G Campitiello
AU  - J.E Carlstrom
AU  - J Carron
AU  - C.L Chang
AU  - P.M Chichura
AU  - A Chokshi
AU  - T.-L Chou
AU  - A Coerver
AU  - T.M Crawford
AU  - T de Haan
AU  - K.R Dibert
AU  - M.A Dobbs
AU  - M Doohan
AU  - D Dutcher
AU  - C Feng
AU  - K.R Ferguson
AU  - N.C Ferree
AU  - K Fichman
AU  - A Foster
AU  - S Galli
AU  - A.E Gambrel
AU  - A.K Gao
AU  - F Ge
AU  - F Guidi
AU  - S Guns
AU  - N.W Halverson
AU  - E Hivon
AU  - G.P Holder
AU  - W.L Holzapfel
AU  - J.C Hood
AU  - A Hryciuk
AU  - N Huang
AU  - T Jhaveri
AU  - F Kéruzoré
AU  - A.R Khalife
AU  - L Knox
AU  - K Kornoelje
AU  - C.-L Kuo
AU  - K Levy
AU  - Y Li
PY  - 2026
DA  - 2026/08/31
PB  - HAL
DO  - 10.48550/arxiv.2608.31136
UR  - https://hal.science/hal-05742669v1
AB  - 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 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 ≲ 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 ΛCDM model that best fits the combined Planck, ACT DR6, and SPT-3G D1 TT/TE/EE likelihoods (CMB_SPA). We further measure the structure-growth parameter σ_8Ω_m^0.25 to be 0.6046±0.0096 from the SPT-3G D1 lensing spectrum alone and 0.6020±0.0084 when combined with ACT DR6 and Planck PR4 CMB lensing. By further combining this with CMB_SPA and the latest DESI DR2 BAO data, we obtain ∑ m_ν < 0.072 eV (95% C.L.) when allowing the neutrino mass to vary within ΛCDM. Compared with previous work, the better agreement of our measurement with DESI DR2 BAO yields both this relaxed upper bound and reduced (mathord∼2σ) preferences for nonzero spatial curvature and for deviations of (w_0,w_a) from the ΛCDM expectation. When we combine CMB lensing with the DES Y3 3×2pt analysis, we obtain S_8=0.811±0.011, corresponding to a 1.4% constraint on the late-time clustering amplitude. This precision is competitive with that obtained from the primary CMB within ΛCDM.
ER  -