- Calderon, R;
- Lodha, K;
- Shafieloo, A;
- Linder, E;
- Sohn, W;
- de Mattia, A;
- Cervantes-Cota, JL;
- Crittenden, R;
- Davis, TM;
- Ishak, M;
- Kim, AG;
- 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, JE;
- Gaztañaga, E;
- Gontcho, S Gontcho A;
- Honscheid, K;
- Howlett, C;
- Juneau, S;
- Kremin, A;
- Landriau, M;
- Le Guillou, L;
- Levi, ME;
- Manera, M;
- Miquel, R;
- Moustakas, J;
- Newman, JA;
- Palanque-Delabrouille, N;
- Percival, WJ;
- 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, BA;
- Zarrouk, P;
- Zou, H
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.