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We present a further observational analysis of the ₒCDM model proposed in Akarsu et al. Phys. Rev. D 104, 123512 (2021). This model is based on the recent conjecture suggesting the Universe has transitioned from anti--de Sitter vacua to de Sitter vacua (viz. , the cosmological constant switches sign from negative to positive), at redshift z_2, inspired by the graduated dark energy model proposed in Akarsu et al. Phys. Rev. D 101, 063528 (2020). ₒCDM was previously claimed to simultaneously relax five cosmological discrepancies, namely, the H₀, S₈, and M₁ tensions along with the Ly- and ₁ anomalies, which prevail within the standard model as well as its canonical/simple extensions. In the present work, we extend the previous analysis by constraining the model using the Pantheon data (with and without the SH0ES M₁ prior) and/or the completed BAO data along with the full Planck CMB data. We find that ₒCDM exhibits a better fit to the data compared to, and simultaneously relaxes the six discrepancies of, viz. , the H₀, M₁, S₈, Ly-, t₀, and ₁ discrepancies, all of which are discussed in detail. When the M₁ prior is included in the analyses, ₒCDM performs significantly better in relaxing the H₀, M₁, and S₈ tensions with the constraint z_1. 8 even when the Ly- data (which imposed the z_2 constraint in the previous studies) are excluded. In contrast, the presence of the M₁ prior causes only negligible improvements for. Thus, the ₒCDM model provides remedy to various cosmological tensions simultaneously, only that the galaxy BAO data hinder its success to some extent.
Akarsu et al. (Fri,) studied this question.