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

Kim, Joshua, Sailer, Noah, Madhavacheril, Mathew S., Ferraro, Simone, Abril-Cabezas, Irene, Aguilar, Jessica Nicole, Ahlen, Steven, Bond, J. Richard, Brooks, David, Burtin, Etienne, Calabrese, Erminia ORCID: https://orcid.org/0000-0003-0837-0068, Chen, Shi-Fan, Choi, Steve K., Claybaugh, Todd, Darwish, Omar, de la Macorra, Axel, DeRose, Joseph, Devlin, Mark, Dey, Arjun, Doel, Peter, Dunkley, Jo, Embil-Villagra, Carmen, Farren, Gerrit S., Font-Ribera, Andreu, Forero-Romero, Jaime E., Gaztañaga, Enrique, Gluscevic, Vera, Gontcho, Satya Gontcho A., Guy, Julien, Honscheid, Klaus, Howlett, Cullan, Kirkby, David, Kisner, Theodore, Kremin, Anthony, Landriau, Martin, Guillou, Laurent Le, Levi, Michael E., MacCrann, Niall, Manera, Marc, Marques, Gabriela A., Meisner, Aaron, Miquel, Ramon, Moodley, Kavilan, Moustakas, John, Newburgh, Laura B., Newman, Jeffrey A., Niz, Gustavo, Orlowski-Scherer, John, Palanque-Delabrouille, Nathalie, Percival, Will J., Prada, Francisco, Qu, Frank J., Rossi, Graziano, Sanchez, Eusebio, Schaan, Emmanuel, Schlafly, Edward F., Schlegel, David, Schubnell, Michael, Sehgal, Neelima, Seo, Hee-Jung, Shaikh, Shabbir, Sherwin, Blake D., Sifón, Cristóbal, Sprayberry, David, Staggs, Suzanne T., Tarlé, Gregory, van Engelen, Alexander, Weaver, Benjamin Alan, Wenzl, Lukas, White, Martin, Wollack, Edward J., Yèche, Christophe and Zou, Hu 2024. 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. Journal of Cosmology and Astroparticle Physics 2024 (12) , 022. 10.1088/1475-7516/2024/12/022

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Abstract

We present a high-significance cross-correlation of CMB lensing maps from the Atacama Cosmology Telescope (ACT) Data Release 6 (DR6) with luminous red galaxies (LRGs) from the Dark Energy Spectroscopic Instrument (DESI) Legacy Survey spectroscopically calibrated by DESI. We detect this cross-correlation at a significance of 38σ; combining our measurement with the Planck Public Release 4 (PR4) lensing map, we detect the cross-correlation at 50σ. Fitting this jointly with the galaxy auto-correlation power spectrum to break the galaxy bias degeneracy with σ 8, we perform a tomographic analysis in four LRG redshift bins spanning 0.4 ≤ z ≤ 1.0 to constrain the amplitude of matter density fluctuations through the parameter combination S 8 × = σ 8 (Ω m / 0.3)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 max = 0.6 h/ Mpc, we obtain a 3.3% constraint on S 8 × = σ 8 (Ω m / 0.3)0.4 = 0.792+0.024 -0.028 from ACT data, as well as constraints on S 8 ×(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 1.2σ. Jointly fitting ACT and Planck lensing cross-correlations we obtain a 2.7% constraint of S 8 × = 0.776+0.019 -0.021, which is consistent with the Planck early-universe extrapolation within 2.1σ, 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 ΛCDM model over cosmic time.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Physics and Astronomy
Additional Information:	License information from Publisher: LICENSE 1: URL: http://creativecommons.org/licenses/by/4.0/, Type: cc-by
Publisher:	IOP Publishing
ISSN:	1475-7516
Date of First Compliant Deposit:	11 December 2024
Date of Acceptance:	8 November 2024
Last Modified:	11 Dec 2024 09:46
URI:	https://orca.cardiff.ac.uk/id/eprint/174675

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