DESI 2024: Reconstructing Dark Energy using Crossing Statistics with DESI DR1 BAO data

• Main Authors: Calderon, R, Lodha, K, Shafieloo, A, Linder, E, Sohn, W, de Mattia, A, Cervantes-Cota, J. L, Crittenden, R, Davis, T. M, Ishak, M, Kim, A. G, Matthewson, W, Niz, G, Park, S, Aguilar, J, Ahlen, S, Allen, S, Brooks, D, Claybaugh, T, de la Macorra, A, Dey, A, Dey, B, Doel, P, Forero-Romero, J. E, Gaztañaga, E, Gontcho, S. Gontcho A, Honscheid, K, Howlett, C, Juneau, S, Kremin, A, Landriau, M, Guillou, L. Le, Levi, M. E, Manera, M, Miquel, R, Moustakas, J, Newman, J. A, Palanque-Delabrouille, N, Percival, W. J, Poppett, C, Prada, F, Rezaie, M, Rossi, G, Ruhlmann-Kleider, V, Sanchez, E, Schlegel, D, Schubnell, M, Seo, H, Sprayberry, D, Tarlé, G, Taylor, P, Vargas-Magaña, M, Weaver, B. A, Zarrouk, P, Zou, H
• Format: Journal Article
• Language: English
• Published: 25-10-2024
• Subjects: Physics - Cosmology and Nongalactic Astrophysics
• DOI: 10.48550/arxiv.2405.04216

JCAP10(2024)048 We implement Crossing Statistics to reconstruct in a model-agnostic manner
the expansion history of the universe and properties of dark energy, using DESI
Data Release 1 (DR1) BAO data in combination with one of three different
supernova compilations (PantheonPlus, Union3, and DES-SN5YR) and Planck CMB
observations. Our results hint towards an evolving and emergent dark energy
behaviour, with negligible presence of dark energy at $z\gtrsim 1$, at varying
significance depending on the data sets combined. In all these reconstructions,
the cosmological constant lies outside the $95\%$ confidence intervals for some
redshift ranges. This dark energy behaviour, reconstructed using Crossing
Statistics, is in agreement with results from the conventional $w_0$--$w_a$
dark energy equation of state parametrization reported in the DESI Key
cosmology paper. Our results add an extensive class of model-agnostic
reconstructions with acceptable fits to the data, including models where cosmic
acceleration slows down at low redshifts. We also report constraints on
$H_0r_d$ from our model-agnostic analysis, independent of the pre-recombination
physics.