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arXiv 2602.09498gr-qc
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对相互作用早期暗能量的约束:基于修改的温度-红移关系和CMB声学尺度

Constraints on Interacting Early Dark Energy from a Modified Temperature-Redshift Relation and CMB Acoustic Scales

Shahid Rajaee Teacher Training University(沙希德·拉贾伊教师培训大学)

Y Bisabr

AI总结:

本研究通过修改的温度-红移关系和CMB声学尺度,对早期暗能量与辐射的相互作用进行约束,揭示了耦合强度的限制。

摘要:

哈勃张力,反映早期和晚期时间确定哈勃常数之间持续的不一致,继续推动标准宇宙学模型的扩展。哈勃张力促使扩展标准宇宙学模型,修改再结合前的物理。在本工作中,我们研究了一个早期暗能量标量场与辐射在再结合前的耦合。这种相互作用导致两个组成部分之间的能量交换,并修改标准宇宙微波背景温度红移关系。我们从背景方程中推导出修改后的温度演化,并将其解释为有效光子非守恒。我们还研究了紧耦合范围内相关的宇宙微波背景声学物理中的线性标量扰动。我们证明相互作用影响背景演化,而不会在扰动水平上引入新的动力学自由度。主要的观测效应通过再结合时声学 horizon 的位移产生,这会修改角声学尺度。利用普朗克对声学尺度的约束,我们获得耦合强度的一致性限制,并显示偏离标准温度红移关系的偏差受到严格限制。

英文摘要:

The Hubble tension, reflecting a persistent discrepancy between early- and late-time determinations of the Hubble constant, continues to motivate extensions of the standard cosmological model The Hubble tension motivates extensions of the standard cosmological model that modify pre-recombination physics. In this work we study an early dark energy scalar field coupled to radiation prior to recombination. The interaction leads to energy exchange between the two components and modifies the standard cosmic microwave background temperature redshift relation. We derive the modified temperature evolution from the background equations and interpret it in terms of effective photon non-conservation. We also study linear scalar perturbations in the tight-coupling regime relevant for cosmic microwave background acoustic physics. We show that the interaction affects the background evolution without introducing new dynamical degrees of freedom at the perturbation level. The dominant observational effect arises through a shift in the sound horizon at recombination, which modifies the angular acoustic scale. Using the Planck constraint on the acoustic scale we obtain a consistency bound on the coupling strength and show that deviations from the standard temperature redshift relation are tightly constrained.

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