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arXiv 2201.12000astro-ph.COgr-qchep-th
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一个光谱治愈它们:来自早期宇宙的签名解决了宇宙学中的主要异常和紧张局势

One spectrum to cure them all: Signature from early Universe solves major anomalies and tensions in cosmology

Dhiraj Kumar Hazra, Akhil Antony, Arman Shafieloo

摘要:

普朗克卫星观测到的宇宙微波背景(CMB)温度谱中的声峰似乎比我们根据标准模型透镜效应所预期的要平滑。这种反常效应也可以通过空间封闭的宇宙来模拟,宇宙具有非常低的哈勃常数,从而消除了宇宙学观测之间已经存在的不一致性。我们重建了早期宇宙的一个签名,一种具有特征频率的量子波动原始光谱中的特殊振荡形式,解决了所有这些异常。有趣的是,我们发现这种形式的原始光谱解决或基本上消退,在宇宙学的标准模型在拟合不同的观测,即普朗克CMB,集群和弱透镜剪切测量从几个大尺度结构调查,哈勃常数的本地测量,以及最近估计的宇宙年龄从球状星团的各种紧张局势。我们支持我们的发现现象学,提出了一个分析形式的原始光谱具有类似的功能,并证明它非常符合各种组合的宇宙学观测。我们进一步支持我们的研究结果在理论上,通过引入一个单一的标量场潜在的通货膨胀,可以产生这样一种形式的原始频谱。

英文摘要:

Acoustic peaks in the Cosmic Microwave Background (CMB) temperature spectrum as observed by the Planck satellite appear to be smoother than our expectation from the standard model lensing effect. This anomalous effect can be also mimicked by a spatially closed Universe with a very low value of Hubble constant that consequently aggravates the already existing discordance between cosmological observations. We reconstruct a signature from the early Universe, a particular form of oscillation in the primordial spectrum of quantum fluctuations with a characteristic frequency, that solves all these anomalies. Interestingly, we find this form of the primordial spectrum resolves or substantially subsides, various tensions in the standard model of cosmology in fitting different observations, namely Planck CMB, clustering and weak lensing shear measurements from several large scale structure surveys, local measurements of Hubble constant, and recently estimated age of the Universe from globular clusters. We support our findings phenomenologically, by proposing an analytical form of the primordial spectrum with similar features and demonstrate that it agrees remarkably well with various combinations of cosmological observations. We support further our findings theoretically, by introducing a single scalar field potential for inflation that can generate such a form of the primordial spectrum.

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