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Analysis reveals the impact of dataset and methodology on transition redshift constraints, suggesting links to Hubble tension.
The motivation of this paper is to obtain reliable constraints of transition redshift (zztr) and, in combination with the evolution of the Hubble constant (H0) that could alleviate the Hubble tension, discuss the possible origin of the tension. Utilizing the latest H(z) measurements and different methods (ΛCDM model, Cosmography, and Gaussian process method), we investigated the impact of methodology and dataset on zztr constraints, and find that the choice of method has a greater impact on ztr than the observations themselves. Through a statistical analysis of the zztr constraints from 2004 to 2024, we find that total ztr constraints (2004−2024) can be well described by a Gaussian function with the mean value 0.65 and the standard deviation 0.16; that is, z̄ₜᵣ(all) = 0.65 ± 0.16. And we confirmed that both dataset and methodology can indeed significantly affect the final constraints. The screened ztr constraints with free H0 gives a new result z̄ₜᵣ(free) = 0.64 ± 0.16. Coincidentally, the ztr results overlap with the initial moment of H0 evolution (H0 value starts to deviate from the Planck result). This may suggest that the Hubble tension might be closely related to this particular period in the evolution of the Universe.
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Hu et al. (2025) studied this question.
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