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arXiv · 2506.15739

Possible evidences for physics beyond $\Lambda$CDM from DESI DR2 data

Rong-Jia Yang
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Abstract

We analyze DESI DR2 data with a model-independent method and find that: (a) the expansion of the universe may speed up with a confidence level more than 2.3 $\sigma$ at redshift $z_{51}\in (0.51, 0.955)$; (b) the expansion of the universe may speed down with a confidence level greater than 1.7 $\sigma$ at redshift $z_{75}\in (0.955, 1.484)$; (c) $w_{\rm{x}}\leq w_{\rm{t}}<-1$ with confidence level exceeding 1.6 $\sigma$ at redshift $z_{53}\in (0.922, 0.955)$.

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Rong-Jia Yang. 2025-06-17. Possible evidences for physics beyond $\Lambda$CDM from DESI DR2 data. https://doi.org/10.1142/s0217732326500434

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