{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/the-atacama-cosmology-telescope-multi-probe","title":"The Atacama Cosmology Telescope: Multi-probe cosmology with unWISE galaxies and ACT DR6 CMB lensing","arxiv_id":"2409.02109","date":"2024-09-03","proceeding":null,"authors":["Gerrit S. Farren","Alex Krolewski","Frank J. Qu","Simone Ferraro","Erminia Calabrese","Jo Dunkley","Carmen Embil Villagra","J. Colin Hill","Joshua Kim","Mathew S. Madhavacheril","Kavilan Moodley","Lyman A. Page","Bruce Partridge","Neelima Sehgal","Blake D. Sherwin","Cristóbal Sifón","Suzanne T. Staggs","Alexander Van Engelen","Edward J. Wollack"],"abstract":"We present a joint analysis of the CMB lensing power spectra measured from the Data Release 6 of the Atacama Cosmology Telescope and Planck PR4, cross-correlations between the ACT and Planck lensing reconstruction and galaxy clustering from unWISE, and the unWISE clustering auto-spectrum. We obtain 1.5% constraints on the matter density fluctuations at late times parametrised by the best constrained parameter combination $S_8^{\\rm 3x2pt}\\equiv\\sigma_8 (\\Omega_m/0.3)^{0.4}=0.815\\pm0.012$. The commonly used $S_8\\equiv\\sigma_8 (\\Omega_m/0.3)^{0.5}$ parameter is constrained to $S_8=0.816\\pm0.015$. In combination with baryon acoustic oscillation (BAO) measurements we find $\\sigma_8=0.815\\pm 0.012$. We also present sound-horizon-independent estimates of the present day Hubble rate of $H_0=66.4^{+3.2}_{-3.7} \\,\\mathrm{km}\\,\\mathrm{s}^{-1}\\mathrm{Mpc}^{-1}$ from our large scale structure data alone and $H_0=64.3^{+2.1}_{-2.4}\\,\\mathrm{km}\\,\\mathrm{s}^{-1}\\mathrm{Mpc}^{-1}$ in combination with uncalibrated supernovae from Pantheon+. Using parametric estimates of the evolution of matter density fluctuations, we place constraints on cosmic structure in a range of high redshifts typically inaccessible with cross-correlation analyses. Combining lensing cross- and auto-correlations, we derive a 3.3% constraint on the integrated matter density fluctuations above $z=2.4$, one of the tightest constraints in this redshift range and fully consistent with a $\\Lambda$CDM model fit to the primary CMB from Planck. Combining with primary CMB observations and using the extended low redshift coverage of these combined data sets we derive constraints on a variety of extensions to the $\\Lambda$CDM model including massive neutrinos, spatial curvature, and dark energy. We find in flat $\\Lambda$CDM $\\sum m_\\nu<0.12$ eV at 95% confidence using the LSS data, BAO measurements from SDSS and primary CMB observations.","url_abs":"https://arxiv.org/abs/2409.02109v2","url_pdf":"https://arxiv.org/pdf/2409.02109v2.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"the-atacama-cosmology-telescope-multi-probe","repo_url":"https://github.com/actcollaboration/unwisexlens_lklh","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":1,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}