DESI 2024: Reconstructing Dark Energy using Crossing Statistics with DESI DR1 BAO data
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 , at varying significance depending on the data sets combined. In all these reconstructions, the cosmological constant lies outside the confidence intervals for some redshift ranges. This dark energy behaviour, reconstructed using Crossing Statistics, is in agreement with results from the conventional -- 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 from our model-agnostic analysis, independent of the pre-recombination physics.
Keywords
Cite
@article{arxiv.2405.04216,
title = {DESI 2024: Reconstructing Dark Energy using Crossing Statistics with DESI DR1 BAO data},
author = {R. Calderon and K. Lodha and A. Shafieloo and E. Linder and W. Sohn and A. de Mattia and J. L. Cervantes-Cota and R. Crittenden and T. M. Davis and M. Ishak and A. G. Kim and W. Matthewson and G. Niz and S. Park and J. Aguilar and S. Ahlen and S. Allen and D. Brooks and T. Claybaugh and A. de la Macorra and A. Dey and B. Dey and P. Doel and J. E. Forero-Romero and E. Gaztañaga and S. Gontcho A Gontcho and K. Honscheid and C. Howlett and S. Juneau and A. Kremin and M. Landriau and L. Le Guillou and M. E. Levi and M. Manera and R. Miquel and J. Moustakas and J. A. Newman and N. Palanque-Delabrouille and W. J. Percival and C. Poppett and F. Prada and M. Rezaie and G. Rossi and V. Ruhlmann-Kleider and E. Sanchez and D. Schlegel and M. Schubnell and H. Seo and D. Sprayberry and G. Tarlé and P. Taylor and M. Vargas-Magaña and B. A. Weaver and P. Zarrouk and H. Zou},
journal= {arXiv preprint arXiv:2405.04216},
year = {2024}
}
Comments
25 pages, 10 figures. Version accepted in JCAP