{"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-dr6-and-desi","title":"The Atacama Cosmology Telescope DR6 and DESI: Structure formation over cosmic time with a measurement of the cross-correlation of CMB Lensing and Luminous Red Galaxies","arxiv_id":"2407.04606","date":"2024-07-05","proceeding":null,"authors":["Joshua Kim","Noah Sailer","Mathew S. Madhavacheril","Simone Ferraro","Irene Abril-Cabezas","Jessica Nicole Aguilar","Steven Ahlen","J. Richard Bond","David Brooks","Etienne Burtin","Erminia Calabrese","Shi-Fan Chen","Steve K. Choi","Todd Claybaugh","Omar Darwish","Axel de la Macorra","Joseph DeRose","Mark Devlin","Arjun Dey","Peter Doel","Jo Dunkley","Carmen Embil-Villagra","Gerrit S. Farren","Andreu Font-Ribera","Jaime E. Forero-Romero","Enrique Gaztañaga","Vera Gluscevic","Satya Gontcho A Gontcho","Julien Guy","Klaus Honscheid","Cullan Howlett","David Kirkby","Theodore Kisner","Anthony Kremin","Martin Landriau","Laurent Le Guillou","Michael E. Levi","Niall MacCrann","Marc Manera","Gabriela A. Marques","Aaron Meisner","Ramon Miquel","Kavilan Moodley","John Moustakas","Laura B. Newburgh","Jeffrey A. Newman","Gustavo Niz","John Orlowski-Scherer","Nathalie Palanque-Delabrouille","Will J. Percival","Francisco Prada","Frank J. Qu","Graziano Rossi","Eusebio Sanchez","Emmanuel Schaan","Edward F. Schlafly","David Schlegel","Michael Schubnell","Neelima Sehgal","Hee-Jung Seo","Shabbir Shaikh","Blake D. Sherwin","Cristóbal Sifón","David Sprayberry","Suzanne T. Staggs","Gregory Tarlé","Alexander van Engelen","Benjamin Alan Weaver","Lukas Wenzl","Martin White","Edward J. Wollack","Christophe Yèche","Hu Zou"],"abstract":"We present a high-significance cross-correlation of CMB lensing maps from the Atacama Cosmology Telescope (ACT) Data Release 6 (DR6) with spectroscopically calibrated luminous red galaxies (LRGs) from the Dark Energy Spectroscopic Instrument (DESI). We detect this cross-correlation at a significance of 38$\\sigma$; combining our measurement with the Planck Public Release 4 (PR4) lensing map, we detect the cross-correlation at 50$\\sigma$. Fitting this jointly with the galaxy auto-correlation power spectrum to break the galaxy bias degeneracy with $\\sigma_8$, we perform a tomographic analysis in four LRG redshift bins spanning $0.4 \\le z \\le 1.0$ to constrain the amplitude of matter density fluctuations through the parameter combination $S_8^\\times = \\sigma_8 \\left(\\Omega_m / 0.3\\right)^{0.4}$. Prior to unblinding, we confirm with extragalactic simulations that foreground biases are negligible and carry out a comprehensive suite of null and consistency tests. Using a hybrid effective field theory (HEFT) model that allows scales as small as $k_{\\rm max}=0.6$ $h/{\\rm Mpc}$, we obtain a 3.3% constraint on $S_8^\\times = \\sigma_8 \\left(\\Omega_m / 0.3\\right)^{0.4} = 0.792^{+0.024}_{-0.028}$ from ACT data, as well as constraints on $S_8^\\times(z)$ that probe structure formation over cosmic time. Our result is consistent with the early-universe extrapolation from primary CMB anisotropies measured by Planck PR4 within 1.2$\\sigma$. Jointly fitting ACT and Planck lensing cross-correlations we obtain a 2.7% constraint of $S_8^\\times = 0.776^{+0.019}_{-0.021}$, which is consistent with the Planck early-universe extrapolation within 2.1$\\sigma$, with the lowest redshift bin showing the largest difference in mean. The latter may motivate further CMB lensing tomography analyses at $z<0.6$ to assess the impact of potential systematics or the consistency of the $\\Lambda$CDM model over cosmic time.","url_abs":"https://arxiv.org/abs/2407.04606v1","url_pdf":"https://arxiv.org/pdf/2407.04606v1.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-dr6-and-desi","repo_url":"https://github.com/NoahSailer/MaPar","is_official":0,"mentioned_in_paper":0,"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}