e-Article
DESI 2024: Reconstructing Dark Energy using Crossing Statistics with DESI DR1 BAO data
Document Type
Working Paper
Author
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.
Source
JCAP10(2024)048
Subject
Language
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 $z\gtrsim 1$, 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.
Comment: 25 pages, 10 figures. Version accepted in JCAP
Comment: 25 pages, 10 figures. Version accepted in JCAP