2025/04/30 by Yang, Rong-Jia · 1 citation
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc)
paper · doi:10.48550/arxiv.2505.00058
Using a model-independent analysis method, we analyze H(z) parameter data with some restrictive conditions. We find that: (a) the Universe may experience an accelerated expansion with a confidence level greater than 5 σ at redshift z101∈ (0, 0.36) and greater than 1.9 σ at redshifts z3835∈ (1.3, 1.53) and z3836∈ (1.43, 1.53); (b) the Universe may experience a decelerated expansion with a confidence level greater than 1.5 σ at redshift z2012∈ (0.40, 0.52); (c) w_\rmx≤ w_\rmt<-1 with confidence level great than 1.6 σ at redshift z3836∈ (1.43, 1.53).