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arXiv 2401.04293astro-ph.COgr-qcmath-phmath.MP
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暗能量有多暗?

How Dark is Dark Energy?

Mauro Carfora, Francesca Familiari

AI总结:

本文利用尺度相关能量泛函比较不同宇宙学观察者的天球数据,发现晚近引力结构诱导的有效宇宙学常数修正与 FLRW 宇宙学常数同量级,可能改变对暗能量角色的解释。

摘要:

暗能量的本质是宇宙学的基本问题之一。它被引入以解释宇宙膨胀的明显加速,但其起源仍有待确定。在本文中,我们阐述了一个可能对理解暗能量与晚近宇宙结构形成之间的关系产生重大影响的结果。我们的分析利用一种尺度相关能量泛函(最初为图像可视化而开发),来比较不同宇宙学观察者在其天球上记录的物理与几何数据。在存在晚近引力结构的情况下,该泛函提供了一种非微扰技术,允许标准的 Friedmann-Lemaître-Robertson-Walker (FLRW) 观察者评估理想化的 FLRW 过去光锥与物理光锥之间可测量的、尺度相关的差异。从 FLRW 观察者的角度看,这种差异表现为对 FLRW 宇宙学常数 $Λ^{(FLRW)}$ 的一个依赖于红移的修正 $Λ^{(corr)}(z)$。在宇宙学膨胀与引力结构的局部维里化动力学耦合的尺度上,我们得到 $Λ^{(corr)}(z)\sim 10^{-52}\\,m^{-2}$,表明晚近结构诱导的有效宇宙学常数与 FLRW 宇宙学常数的假定值同量级,这一结果可能导致对暗能量本身角色的解释性转变。

英文摘要:

The nature of dark energy is one of the fundamental problems in cosmology. Introduced to explain the apparent acceleration of the Universe's expansion, its origin remains to be determined. In this paper, we illustrate a result that may significantly impact understanding the relationship between dark energy and structure formation in the late-epoch Universe. Our analysis exploits a scale-dependent energy functional, initially developed for image visualization, to compare the physical and geometrical data that distinct cosmological observers register on their celestial spheres. In the presence of late-epoch gravitational structures, this functional provides a non-perturbative technique that allows the standard Friedmann-Lemaître-Robertson-Walker (FLRW) observer to evaluate a measurable, scale-dependent difference between the idealized FLRW past light cone and the physical light cone. From the point of view of the FLRW observer, this difference manifests itself as a redshift-dependent correction $Λ^{(corr)}(z)$ to the FLRW cosmological constant $Λ^{(FLRW)}$. At the scale where cosmological expansion couples with the local virialized dynamics of gravitational structures, we get $Λ^{(corr)}(z)\sim 10^{-52}\,m^{-2}$, indicating that the late-epoch structures induce an effective cosmological constant that is of the same order of magnitude as the assumed value of the FLRW cosmological constant, a result that may lead to an interpretative shift in the very role of dark energy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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