Lodha, K;
Calderon, R;
Matthewson, WL;
Shafieloo, A;
Ishak, M;
Pan, J;
Garcia-Quintero, C;
... DESI Collaboration; + view all
(2025)
Extended dark energy analysis using DESI DR2 BAO measurements.
Physical Review D
, 112
(8)
, Article 083511. 10.1103/w4c6-1r5j.
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Abstract
We conduct an extended analysis of dark energy constraints, in support of the findings of the Dark Energy Spectroscopic Instrument (DESI) second data release cosmology key paper, including DESI data, Planck cosmic microwave background observations, and three different supernova compilations. Using a broad range of parametric and nonparametric methods, we explore the dark energy phenomenology and find consistent trends across all approaches, in good agreement with the w0waCDM (cold dark matter) key paper results. Even with the additional flexibility introduced by nonparametric approaches, such as binning and Gaussian processes, we find that extending ΛCDM to include a two-parameter wðzÞ is sufficient to capture the trends present in the data. Finally, we examine three dark energy classes with distinct dynamics, including quintessence scenarios satisfying w ≥ −1, to explore what underlying physics can explain such deviations. The current data indicate a clear preference for models that feature a phantom crossing; although alternatives lacking this feature are disfavored, they cannot yet be ruled out. Our analysis confirms that the evidence for dynamical dark energy, particularly at low redshift (z ≲ 0.3), is robust and stable under different modeling choices.
| Type: | Article |
|---|---|
| Title: | Extended dark energy analysis using DESI DR2 BAO measurements |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/w4c6-1r5j |
| Publisher version: | https://doi.org/10.1103/w4c6-1r5j |
| Language: | English |
| Additional information: | Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license, https://creativecommons.org/licenses/by/4.0/. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10219060 |
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