{"paper":{"title":"The Atacama Cosmology Telescope: High-redshift measurement of structure growth from the cross-correlation of Quaia quasars and CMB lensing from ACT DR6 and $\\textit{Planck}$ PR4","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Alexander van Engelen, Anthony Challinor, Blake Sherwin, Boris Bolliet, Carmen Embil Villagra, Cristobal Sifon, David Alonso, Edward J. Wollack, Fiona McCarthy, Frank J. Qu, Gerrit Farren, Giulio Fabbian, Irene Abril-Cabezas, Jo Dunkley, Joshua Kim, Kavilan Moodley, Niall MacCrann","submitted_at":"2025-07-11T17:59:01Z","abstract_excerpt":"We measure the amplitude of matter fluctuations over a wide range of redshifts by combining CMB lensing observations from ACT DR6 and $\\textit{Planck}$ PR4 with the overdensity of quasars from Quaia, a $\\textit{Gaia}$ and $\\textit{unWISE}$ quasar catalog. Our analysis includes the CMB lensing power spectrum from ACT DR6, the auto-correlation of two Quaia quasar samples centered at $z \\simeq 1.0$ and $z \\simeq 2.1$, and their cross-correlations with CMB lensing from both ACT DR6 and $\\textit{Planck}$ PR4. By performing a series of contamination and systematic null tests, we find no evidence for"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.08798","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2507.08798/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}