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

R. Calderon; K. Lodha; A. Shafieloo; E. Linder; W. Sohn; A. de Mattia; J. L. Cervantes-Cota; R. Crittenden; T. M. Davis; M. Ishak; A. G. Kim; W. Matthewson; G. Niz; S. Park; J. Aguilar; S. Ahlen; S. Allen; D. Brooks; T. Claybaugh; A. de la Macorra; A. Dey; B. Dey; P. Doel; J. E. Forero-Romero; E. Gaztañaga; S. Gontcho A Gontcho; K. Honscheid; C. Howlett; S. Juneau; A. Kremin; M. Landriau; L. Le Guillou; M. E. Levi; M. Manera; R. Miquel; J. Moustakas; J. A. Newman; N. Palanque-Delabrouille; W. J. Percival; C. Poppett; F. Prada; M. Rezaie; G. Rossi; V. Ruhlmann-Kleider; E. Sanchez; D. Schlegel; M. Schubnell; H. Seo; D. Sprayberry; G. Tarlé; P. Taylor; M. Vargas-Magaña; B. A. Weaver; P. Zarrouk; H. Zou

doi:10.1088/1475-7516/2024/10/048

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arXiv · 2405.04216

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

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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.

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R. Calderon, K. Lodha, A. Shafieloo, E. Linder, W. Sohn, A. de Mattia, J. L. Cervantes-Cota, R. Crittenden, T. M. Davis, M. Ishak, A. G. Kim, W. Matthewson, G. Niz, S. Park, J. Aguilar, S. Ahlen, S. Allen, D. Brooks, T. Claybaugh, A. de la Macorra, A. Dey, B. Dey, P. Doel, J. E. Forero-Romero, E. Gaztañaga, S. Gontcho A Gontcho, K. Honscheid, C. Howlett, S. Juneau, A. Kremin, M. Landriau, L. Le Guillou, M. E. Levi, M. Manera, R. Miquel, J. Moustakas, J. A. Newman, N. Palanque-Delabrouille, W. J. Percival, C. Poppett, F. Prada, M. Rezaie, G. Rossi, V. Ruhlmann-Kleider, E. Sanchez, D. Schlegel, M. Schubnell, H. Seo, D. Sprayberry, G. Tarlé, P. Taylor, M. Vargas-Magaña, B. A. Weaver, P. Zarrouk, H. Zou. 2024-05-07. DESI 2024: Reconstructing Dark Energy using Crossing Statistics with DESI DR1 BAO data. https://doi.org/10.1088/1475-7516%2F2024%2F10%2F048

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