{
  "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.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.31136",
  "author_total": 95,
  "authors": [
    {
      "name": "Y Omori"
    },
    {
      "name": "W.L.K Wu"
    },
    {
      "name": "Y Nakato"
    },
    {
      "name": "F Bianchini"
    },
    {
      "name": "L Balkenhol"
    },
    {
      "name": "C Daley"
    },
    {
      "name": "W Quan"
    },
    {
      "name": "E Anderes"
    },
    {
      "name": "A.J Anderson"
    },
    {
      "name": "B Ansarinejad"
    },
    {
      "name": "M Archipley"
    },
    {
      "name": "D.R Barron"
    },
    {
      "name": "P.S Barry"
    },
    {
      "name": "K Benabed"
    },
    {
      "name": "A.N Bender"
    },
    {
      "name": "B.A Benson"
    },
    {
      "name": "L.E Bleem"
    },
    {
      "name": "S Bocquet"
    },
    {
      "name": "F.R Bouchet"
    },
    {
      "name": "E Camphuis"
    },
    {
      "name": "M.G Campitiello"
    },
    {
      "name": "J.E Carlstrom"
    },
    {
      "name": "J Carron"
    },
    {
      "name": "C.L Chang"
    },
    {
      "name": "P.M Chichura"
    },
    {
      "name": "A Chokshi"
    },
    {
      "name": "T.-L Chou"
    },
    {
      "name": "A Coerver"
    },
    {
      "name": "T.M Crawford"
    },
    {
      "name": "T de Haan"
    },
    {
      "name": "K.R Dibert"
    },
    {
      "name": "M.A Dobbs"
    },
    {
      "name": "M Doohan"
    },
    {
      "name": "D Dutcher"
    },
    {
      "name": "C Feng"
    },
    {
      "name": "K.R Ferguson"
    },
    {
      "name": "N.C Ferree"
    },
    {
      "name": "K Fichman"
    },
    {
      "name": "A Foster"
    },
    {
      "name": "S Galli"
    },
    {
      "name": "A.E Gambrel"
    },
    {
      "name": "A.K Gao"
    },
    {
      "name": "F Ge"
    },
    {
      "name": "F Guidi"
    },
    {
      "name": "S Guns"
    },
    {
      "name": "N.W Halverson"
    },
    {
      "name": "E Hivon"
    },
    {
      "name": "G.P Holder"
    },
    {
      "name": "W.L Holzapfel"
    },
    {
      "name": "J.C Hood"
    },
    {
      "name": "A Hryciuk"
    },
    {
      "name": "N Huang"
    },
    {
      "name": "T Jhaveri"
    },
    {
      "name": "F Kéruzoré"
    },
    {
      "name": "A.R Khalife"
    },
    {
      "name": "L Knox"
    },
    {
      "name": "K Kornoelje"
    },
    {
      "name": "C.-L Kuo"
    },
    {
      "name": "K Levy"
    },
    {
      "name": "Y Li"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5t0yr8vyh9trr.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.31136",
  "fulltext_url": null,
  "id": "5t0yr8vyh9trr",
  "issns": [],
  "landing_url": "https://hal.science/hal-05742669v1",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.CO"
    ],
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "1.phys.astr"
    ],
    [
      "openalex",
      "3103|Cosmology and Gravitation Theories"
    ]
  ],
  "openalex": "W7204958121",
  "pdf_url": "https://arxiv.org/pdf/2608.31136",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-31",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5t0yr8vyh9trr.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:31Z",
      "native_id": "hal-05742669",
      "source": "hal",
      "url": "https://hal.science/hal-05742669v1"
    },
    {
      "first_seen": "2026-10-30T12:17:41Z",
      "native_id": "2608.31136",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.31136"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "physics",
      "origin": "hal:0.phys",
      "subfield": "general"
    }
  ],
  "title": "SPT-3G D1: Quadratic-Estimator CMB Lensing Reconstruction and Cosmology",
  "title_text": "SPT-3G D1: Quadratic-Estimator CMB Lensing Reconstruction and Cosmology",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:41Z",
  "url": "https://research.draconitic.com/paper/5t0yr8vyh9trr",
  "venue": "HAL",
  "versions": []
}