DESI 2024: reconstructing dark energy using crossing statistics with DESI DR1 BAO data
R. Calderón, K. Lodha, A. Shafieloo, E. Linder, Wuhyun Sohn, Arnaud de Mattia, Jorge L. Cervantes–Cota, Robert Crittenden, T. M. Davis, M Ishak, Alex Kim, William L. Matthewson, Gustavo Niz, S. Park, J. Aguilar, S. P. Ahlen, S. W. Allen, D. Brooks, T. Claybaugh, Axel de la Macorra, Arjun Dey, Biprateep Dey, P. Doel, J. E. Forero-Romero, E. Gaztañaga, Satya Gontcho A Gontcho, K. Honscheid, Cullan Howlett, S. Juneau, Anthony Kremin, Martin Landriau, L. Le Guillou, M. E. Levi, Marc Manera, R. Miquel, John Moustakas, J. A. Newman, N. Palanque‐Delabrouille, Will J. Percival, Claire Poppett, Francisco Prada, Mehdi Rezaie, Graziano Rossi, V. Ruhlmann-Kleider, E. Sánchez, David J. Schlegel, M. Schubnell, Hee‐Jong Seo, David Sprayberry, G. Tarlé, Paul A. Taylor, M. Vargas-Magaña, B. A. Weaver, Pauline Zarrouk, Hu Zou
Abstract
Abstract 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 ≳ 1, at varying significance depending on 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 0 r d from our model-agnostic analysis, independent of the pre-recombination physics.