Cosmological constraints from the cross-correlation of DESI Luminous Red Galaxies with CMB lensing from Planck PR4 and ACT DR6

Sailer, Noah, Kim, Joshua, Ferraro, Simone, Madhavacheril, Mathew S., White, Martin, Abril-Cabezas, Irene, Aguilar, Jessica Nicole, Ahlen, Steven, Richard Bond, J., Brooks, David, Burtin, Etienne, Calabrese, Erminia ORCID: https://orcid.org/0000-0003-0837-0068, Chen, Shi-Fan, Choi, Steve K., Claybaugh, Todd, Dawson, Kyle, de la Macorra, Axel, DeRose, Joseph, Dey, Arjun, Dey, Biprateep, 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., Honscheid, Klaus, Howlett, Cullan, Juneau, Stephanie, Kirkby, David, Kisner, Theodore, Kremin, Anthony, Landriau, Martin, Guillou, Laurent Le, Levi, Michael, Manera, Marc, Meisner, Aaron, Miquel, Ramon, Moodley, Kavilan, Moustakas, John, Niemack, Michael D., Niz, Gustavo, Palanque-Delabrouille, Nathalie, Percival, Will, Prada, Francisco, Qu, Frank J., Rossi, Graziano, Sanchez, Eusebio, Schaan, Emmanuel, Schlafly, Edward, Schlegel, David, Schubnell, Michael, Sehgal, Neelima, Seo, Hee-Jong, Sherwin, Blake, Sifón, Cristóbal, Sprayberry, David, Staggs, Suzanne T., Tarlé, Gregory, Weaver, Benjamin Alan, Yèche, Christophe, Zhou, Rongpu and Zou, Hu 2025. Cosmological constraints from the cross-correlation of DESI Luminous Red Galaxies with CMB lensing from Planck PR4 and ACT DR6. Journal of Cosmology and Astroparticle Physics 2025 (06) , 008. 10.1088/1475-7516/2025/06/008 Item availability restricted.

PDF - Accepted Post-Print Version Restricted to Repository staff only until 6 June 2026 due to copyright restrictions. Download (10MB)

Abstract

We infer the growth of large scale structure over the redshift range 0.4 ≲ z ≲ 1 from the cross-correlation of spectroscopically calibrated Luminous Red Galaxies (LRGs) selected from the Dark Energy Spectroscopic Instrument (DESI) legacy imaging survey with CMB lensing maps reconstructed from the latest Planck and ACT data. We adopt a hybrid effective field theory (HEFT) model that robustly regulates the cosmological information obtainable from smaller scales, such that our cosmological constraints are reliably derived from the (predominantly) linear regime. We perform an extensive set of bandpower- and parameter-level systematics checks to ensure the robustness of our results and to characterize the uniformity of the LRG sample. We demonstrate that our results are stable to a wide range of modeling assumptions, finding excellent agreement with a linear theory analysis performed on a restricted range of scales. From a tomographic analysis of the four LRG photometric redshift bins we find that the rate of structure growth is consistent with ΛCDM with an overall amplitude that is ≃ 5-7% lower than predicted by primary CMB measurements with modest (∼ 2σ) statistical significance. From the combined analysis of all four bins and their cross-correlations with Planck we obtain S8 = 0.765 ± 0.023, which is less discrepant with primary CMB measurements than previous DESI LRG cross Planck CMB lensing results. From the cross-correlation with ACT we obtain S8 = 0.790+0.024-0.027, while when jointly analyzing Planck and ACT we find S8 = 0.775+0.019-0.022 from our data alone and σ8 = 0.772+0.020-0.023 with the addition of BAO data. These constraints are consistent with the latest Planck primary CMB analyses at the ≃ 1.6-2.2σ level, and are in excellent agreement with galaxy lensing surveys.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Physics and Astronomy
Publisher:	IOP Publishing
ISSN:	1475-7516
Date of First Compliant Deposit:	2 July 2025
Date of Acceptance:	4 May 2025
Last Modified:	03 Jul 2025 11:45
URI:	https://orca.cardiff.ac.uk/id/eprint/179487

Actions (repository staff only)

Edit Item