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arXiv 2203.12930astro-ph.COgr-qchep-ph
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在扩展场景下 Planck 数据没有提供 EDE 的证据

No evidence for EDE from Planck data in extended scenarios

Emanuele Fondi, Alessandro Melchiorri, Luca Pagano

AI总结:

本文研究了扩展参数下Planck数据对早期暗能量(EDE)的约束,发现曲率、暗能量状态方程和透镜幅度等扩展参数对EDE约束无影响,EDE无法解决Planck角谱异常,CMB对EDE的证据主要来自ACT-DR4数据集。

摘要:

ACT CMB 实验的最新数据发布(结合先前的 WMAP 数据)显示了在超过 $3$ 个标准差水平上存在 Early Dark Energy(EDE,早期暗能量)组分的证据。最近的研究表明,当包含限于中等角尺度($l \le 650$)的 Planck 实验温度数据时,同样的结论依然成立;而当考虑完整的 Planck 数据集时,该结论则消失。然而,已有研究表明,完整的 Planck 数据集表现出异常的透镜组分,并在 3 个标准差水平上偏好闭合宇宙。因此,研究这些异常是否可能与早期暗能量组分反相关,从而在参数提取过程中隐藏其存在,显得尤为重要。在此我们证明,扩展的参数选择,如曲率、暗能量状态方程和透镜幅度 $A_L$,对 Planck 关于 EDE 的约束没有影响。实际上,EDE 并不能解决 Planck 角谱异常。这表明,目前 CMB 对 EDE 组分的证据本质上来自 ACT-DR4 数据集。

英文摘要:

The latest data release from the ACT CMB experiment (in combination with previous WMAP data) shows evidence for an Early Dark Energy component at more than $3$ standard deviations. The same conclusion has been recently shown to hold when temperature data from the Planck experiment limited to intermediate angular scales ($l \le 650$) are included while it vanishes when the full Planck dataset is considered. However, it has been shown that the full Planck dataset exhibits an anomalous lensing component and a preference for a closed universe at the level of three standard deviation. It is therefore of utmost importance to investigate if these anomalies could anti-correlate with an early dark energy component and hide its presence during the process of parameter extraction. Here we demonstrate that extended parameters choices as curvature, equation of state of dark energy and lensing amplitude $A_L$ have no impact on the Planck constraints on EDE. In practice, EDE does not solve Planck angular spectra anomalies. This indicates that current CMB evidence for an EDE component comes essentially from the ACT-DR4 dataset.

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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