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arXiv 2005.14053astro-ph.COgr-qchep-ph
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从$α$ -吸引子研究早期暗能量的统一框架

Unified framework for Early Dark Energy from $α$-attractors

Matteo Braglia, William T. Emond, Fabio Finelli, A. Emir Gumrukcuoglu, Kazuya Koyama

摘要:

缓解哈勃张力的最有吸引力的方法之一是包含早期暗能量(EDE)成分,该成分在复合时在狭窄的红移窗口中向宇宙添加能量,并且之后比辐射更快地稀释。本文在$α$ -吸引子模型的框架下分析了EDE。众所周知,能否成功缓解哈勃望远镜的张力,关键取决于能量注入的形状。我们展示了如何不同类型的能量注入可以很容易地获得,由于自由选择的功能形式的潜在的启发$α$吸引模型。为了证实我们的直觉,我们对三种代表性情况进行了MCMC分析,发现$H_0$确实明显大于$Λ$ CDM,就像其他EDE模型一样。不同于轴子驱动的超普朗克衰变常数的EDE模型,EDE模型的曲率所需的数据是自然的背景下,最近的理论发展$α$ -吸引子。

英文摘要:

One of the most appealing approaches to ease the Hubble tension is the inclusion of an early dark energy (EDE) component that adds energy to the Universe in a narrow redshift window around the time of recombination and dilutes faster than radiation afterwards. In this paper, we analyze EDE in the framework of $α$-attractor models. As well known, the success in alleviating the Hubble tension crucially depends on the shape of the energy injection. We show how different types of energy injections can be easily obtained, thanks to the freedom in choosing the functional form of the potential inspired by $α$-attractor models. To confirm our intuition we perform an MCMC analysis for three representative cases and find indeed that $H_0$ is significantly larger than in $Λ$CDM like in other EDE models. Unlike axion-driven EDE models with super Planckian decay constant, the curvature of EDE models required by the data is natural in the context of recent theoretical developments in $α$-attractors.

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