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• W4384298004 abstract "We present a further observational analysis of the ${mathrm{ensuremath{Lambda}}}_{mathrm{s}}mathrm{CDM}$ 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 ${z}_{ifmmodedaggerelsetextdaggerfi{}}ensuremath{sim}2$, inspired by the graduated dark energy model proposed in Akarsu et al. [Phys. Rev. D 101, 063528 (2020)]. ${mathrm{ensuremath{Lambda}}}_{mathrm{s}}mathrm{CDM}$ was previously claimed to simultaneously relax five cosmological discrepancies, namely, the ${H}_{0}$, ${S}_{8}$, and ${M}_{B}$ tensions along with the $mathrm{Ly}text{ensuremath{-}}ensuremath{alpha}$ and ${ensuremath{omega}}_{mathrm{b}}$ anomalies, which prevail within the standard $mathrm{ensuremath{Lambda}}mathrm{CDM}$ 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 ${M}_{B}$ prior) and/or the completed BAO data along with the full Planck CMB data. We find that ${mathrm{ensuremath{Lambda}}}_{mathrm{s}}mathrm{CDM}$ exhibits a better fit to the data compared to $mathrm{ensuremath{Lambda}}mathrm{CDM}$, and simultaneously relaxes the six discrepancies of $mathrm{ensuremath{Lambda}}mathrm{CDM}$, viz., the ${H}_{0}$, ${M}_{B}$, ${S}_{8}$, $mathrm{Ly}text{ensuremath{-}}ensuremath{alpha}$, ${t}_{0}$, and ${ensuremath{omega}}_{mathrm{b}}$ discrepancies, all of which are discussed in detail. When the ${M}_{B}$ prior is included in the analyses, ${mathrm{ensuremath{Lambda}}}_{mathrm{s}}mathrm{CDM}$ performs significantly better in relaxing the ${H}_{0}$, ${M}_{B}$, and ${S}_{8}$ tensions with the constraint ${z}_{ifmmodedaggerelsetextdaggerfi{}}ensuremath{sim}1.8$ even when the $mathrm{Ly}text{ensuremath{-}}ensuremath{alpha}$ data (which imposed the ${z}_{ifmmodedaggerelsetextdaggerfi{}}ensuremath{sim}2$ constraint in the previous studies) are excluded. In contrast, the presence of the ${M}_{B}$ prior causes only negligible improvements for $mathrm{ensuremath{Lambda}}mathrm{CDM}$. Thus, the ${mathrm{ensuremath{Lambda}}}_{mathrm{s}}mathrm{CDM}$ model provides remedy to various cosmological tensions simultaneously, only that the galaxy BAO data hinder its success to some extent." @default.
• W4384298004 created "2023-07-15" @default.
• W4384298004 creator A5021804533 @default.
• W4384298004 creator A5038303597 @default.
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• W4384298004 creator A5069834536 @default.
• W4384298004 date "2023-07-14" @default.
• W4384298004 modified "2023-10-10" @default.
• W4384298004 title "Relaxing cosmological tensions with a sign switching cosmological constant: Improved results with Planck, BAO, and Pantheon data" @default.
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