Reconstruction of a Scale-dependent Gravitational Phase Transition

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Astrophysical Journal Pub Date : 2023-11-01 DOI:10.3847/1538-4357/acfa6e
Marzieh Farhang, Nima Khosravi
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Abstract

Abstract In this work we extend our earlier phenomenological model for a gravitational phase transition and its generalization to early times by letting the modifications in the linearly perturbed Einstein equations be scale dependent. These modifications are characterized as deviations of the parameters μ ( z , k ) and γ ( z , k ) from their values in general relativity (GR). The scale-dependent amplitudes of modified μ ( z , k ) and γ ( z , k ) and the parameters defining the phase transition, along with the standard cosmological parameters, are measured by various data combinations. Out of the perturbation parameters, we construct gravity eigenmodes that represent patterns of perturbations best detectable by data. We detect no significant deviation from GR in these parameters. However, the larger parameter space produced due to the new degrees of freedom allows for the reconciliation of various data sets that are in tension in ΛCDM. In particular, we find H 0 = 71.9 ± 9.2 from anisotropies of the cosmic microwave background as measured by Planck (and various measurements of the baryonic acoustic oscillations, in agreement with local Hubble measurements). We also find that the σ 8 tension between the measurements of the Dark Energy Survey and Planck is reduced to less than 1 σ .
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尺度相关引力相变的重建
通过让线性摄动爱因斯坦方程中的修正是尺度相关的,我们扩展了先前关于引力相变的现象学模型,并将其推广到早期。这些变化表现为参数μ (z, k)和γ (z, k)与广义相对论(GR)值的偏差。修正后的μ (z, k)和γ (z, k)的尺度相关振幅以及定义相变的参数,以及标准宇宙学参数,通过各种数据组合进行测量。在扰动参数之外,我们构建了重力特征模式,它代表了数据最能检测到的扰动模式。我们在这些参数中没有发现与GR的显著偏差。然而,由于新的自由度而产生的更大的参数空间允许协调ΛCDM中处于紧张状态的各种数据集。特别是,我们从普朗克测量的宇宙微波背景各向异性中发现H = 71.9±9.2(以及重子声学振荡的各种测量结果,与局部哈勃测量结果一致)。我们还发现暗能量测量和普朗克测量之间的σ 8张力减小到小于1 σ。
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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