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

TL;DR

This study analyzes DESI DR2 data using a model-independent approach, revealing potential deviations from the standard $ ext{Lambda}$CDM model in the universe's expansion rate at specific redshifts.

Contribution

It provides evidence for possible physics beyond $ ext{Lambda}$CDM$ by identifying redshift-dependent variations in cosmic expansion using DESI DR2 data.

Findings

Universe may accelerate faster at certain redshifts with >2.3σ confidence.

Universe may decelerate at other redshifts with >1.7σ confidence.

Dark energy equation of state parameter suggests $w_x extless -1$ at specific redshifts.

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 $z_{53}\in (0.922, 0.955)$.