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arXiv 2212.13610astro-ph.CO
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一类$α$-吸引子暴胀模型的贝叶斯分析

Bayesian analysis for a class of $α$-attractor inflationary models

Francisco X. Linares Cedeño, Gabriel German, Juan Carlos Hidalgo, Ariadna Montiel

AI总结:

本文对一类推广的$α$-吸引子暴胀势进行贝叶斯分析,发现$p=4$模型最受CMB数据支持,且各情形均倾向于张标比$r\simeq 0.0025$。

摘要:

我们对基本$α$-吸引子T模型的一种推广形式进行了贝叶斯研究,该推广由势函数$V(ϕ)=V_0\left[1-\text{sech}^{p}\left(ϕ/\sqrt{6α}M_{pl}\right)\right]$给出,其中$ϕ$是暴胀场,参数$α$对应于吸引子模型的共形或超共形实现中标量流形的逆曲率。这种推广的特征在于幂次$p$,当$p=2$时包含基本或基准模型。在通过数值探索设定$α$-吸引子势参数的先验之后,我们对$p=1\\, , 2\\, , 3\\, ,4$的情形进行了相应的统计分析,并推导出后验分布。以原始$α$-吸引子势作为基准模型,我们计算了该推广形式的证据,并得出结论:$p=4$模型受到CMB数据的青睐。我们还给出了参数$α$的约束。有趣的是,所有研究的情形都倾向于一个特定的张标比数值,即$r\simeq 0.0025$。

英文摘要:

We perform a Bayesian study of a generalization of the basic $α$-attractor T model given by the potential $V(ϕ)=V_0\left[1-\text{sech}^{p}\left(ϕ/\sqrt{6α}M_{pl}\right)\right]$ where $ϕ$ is the inflaton field and the parameter $α$ corresponds to the inverse curvature of the scalar manifold in the conformal or superconformal realizations of the attractor models. Such generalization is characterized by the power $p$ which includes the basic or base model for $p=2$. Once the priors for the parameters of the $α$-attractor potential are set by numerical exploration, we perform the corresponding statistical analysis for the cases $p=1\, , 2\, , 3\, ,4$, and derive posteriors. Considering the original $α$-attractor potential as the base model, we calculate the evidence for our generalization, and conclude that the $p=4$ model is preferred by the CMB data. We also present constraints for the parameter $α$. Interestingly, all the cases studied prefer a specific value for the tensor-to-scalar ratio given by $r\simeq 0.0025$.

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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