论文标题

使用横向BAO数据进行宇宙学参数分析

Cosmological parameter analyses using transversal BAO data

论文作者

Nunes, Rafael C., Yadav, Santosh K., Jesus, J. F., Bernui, Armando

论文摘要

我们研究了对宇宙学参数的观察约束,结合了15个横向BAO量表的测量值(无基于任何基金会宇宙学)与Planck-CMB数据,以探索某些宇宙学模型的参数空间。我们调查了多少普朗克 +横向BAO数据可以限制最低$λ$ CDM模型,并包括中微子质量尺度$M_ν$,以及动态暗能量(DE)方案的可能性。假设$λ$ CDM宇宙学,我们发现$ h_0 = 69.23 \ pm 0.50 $ km s $ {}^{ - 1} $ mpc $ {}^{ - 1} $,$m_ν<0.11 $ ev和$ r _ {\ rm _ {\ rm drag}横向BAO数据。在假设动力学DE宇宙学时,我们发现包含BAO数据确实可以打破DE自由参数的堕落,从而显着改善了对完整参数空间的约束。我们注意到,该模型与$ H_0 $的本地测量值兼容,并且在此动态de上下文中,$ H_0 $估计值没有张力。此外,我们讨论了联合分析的限制和后果,并与SH0ES的本地$ H_0 $测量值讨论。最后,我们仅使用横向BAO数据中的信息对减速参数$ q(z)$执行独立于模型的分析。

We investigate observational constraints on cosmological parameters combining 15 measurements of the transversal BAO scale (obtained free of any fiducial cosmology) with Planck-CMB data to explore the parametric space of some cosmological models. We investigate how much Planck + transversal BAO data can constraint the minimum $Λ$CDM model, and extensions, including neutrinos mass scale $M_ν$, and the possibility for a dynamical dark energy (DE) scenario. Assuming the $Λ$CDM cosmology, we find $H_0 = 69.23 \pm 0.50$ km s${}^{-1}$ Mpc${}^{-1}$, $M_ν < 0.11$ eV and $r_{\rm drag} = 147.59 \pm 0.26$ Mpc (the sound horizon at drag epoch) from Planck + transversal BAO data. When assuming a dynamical DE cosmology, we find that the inclusion of the BAO data can indeed break the degeneracy of the DE free parameters, improving the constraints on the full parameter space significantly. We note that the model is compatible with local measurements of $H_0$ and there is no tension on $H_0$ estimates in this dynamical DE context. Also, we discuss constraints and consequences from a joint analysis with the local $H_0$ measurement from SH0ES. Finally, we perform a model-independent analysis for the deceleration parameter, $q(z)$, using only information from transversal BAO data.

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