论文标题
带有标志切换宇宙常数的放松宇宙张力：Planck，Bao和万神殿数据改善了结果
Relaxing cosmological tensions with a sign switching cosmological constant: Improved results with Planck, BAO, and Pantheon data
论文作者
论文摘要
我们提供了对Akarsu等人提出的$λ_{\ rm S} $ CDM模型的进一步观察分析。 [物理。 Rev. D 104，123512（2021）]。该模型基于最近的猜想，表明宇宙已经从抗De保姆真空过渡到de Sitter Vacua（即，宇宙学常数开关从负面到正的符号），在RedShift $ {Z_ \ Dagger \ Sim2} $上，受到了毕业于的Dark Energy模型的启发。 [物理。修订版D 101，063528（2020）]。 $Λ_{\rm s}$CDM was previously claimed to simultaneously relax five cosmological discrepancies, namely, the $H_0$, $S_8$, and $M_B$ tensions along with the Ly-$α$ and $ω_{\rm b}$ anomalies, which prevail within the standard $Λ$CDM model as well as its canonical/simple扩展。在当前工作中，我们通过使用万神殿数据（有和没有SH0ES $ M_B $ PIRIS）和/或完整的Planck CMB数据来限制模型来扩展先前的分析。我们发现$λ_ {\ rm s} $ cdm与$λ$ cdm相比表现更好，同时放松了六个差异$λ$ cdm，viz。其中详细讨论。当分析中包含$ m_b $先验时，$λ_{\ rm s} $ cdm在放松$ h_0 $，$ m_b $和$ s_8 $张力方面的性能要好得多。研究被排除在外。相比之下，$ m_b $ prior的存在仅导致$λ$ CDM的改进可忽略不计。因此，$λ_{\ rm s} $ CDM模型同时为各种宇宙张力提供了补救措施，只有Galaxy Bao数据在某种程度上阻碍了其成功。
We present a further observational analysis of the $Λ_{\rm s}$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 ${z_\dagger\sim2}$, inspired by the graduated dark energy model proposed in Akarsu et al. [Phys. Rev. D 101, 063528 (2020)]. $Λ_{\rm s}$CDM was previously claimed to simultaneously relax five cosmological discrepancies, namely, the $H_0$, $S_8$, and $M_B$ tensions along with the Ly-$α$ and $ω_{\rm b}$ anomalies, which prevail within the standard $Λ$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 $Λ_{\rm s}$CDM exhibits a better fit to the data compared to $Λ$CDM, and simultaneously relaxes the six discrepancies of $Λ$CDM, viz., the $H_0$, $M_B$, $S_8$, Ly-$α$, $t_0$, and $ω_{\rm b}$ discrepancies, all of which are discussed in detail. When the $M_B$ prior is included in the analyses, $Λ_{\rm s}$CDM performs significantly better in relaxing the $H_0$, $M_B$, and $S_8$ tensions with the constraint ${z_\dagger\sim1.8}$ even when the Ly-$α$ data (which imposed the $z_\dagger\sim2$ constraint in the previous studies) are excluded. In contrast, the presence of the $M_B$ prior causes only negligible improvements for $Λ$CDM. Thus, the $Λ_{\rm s}$CDM model provides remedy to various cosmological tensions simultaneously, only that the galaxy BAO data hinder its success to some extent.
