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arXiv 1405.7399hep-thastro-ph.COgr-qchep-ph
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CMB数据能约束暴胀场的范围吗?

Can CMB data constrain the inflationary field range?

Juan Garcia-Bellido, Diederik Roest, Marco Scalisi, Ivonne Zavala

摘要:

我们研究在何种程度上的频谱指数$n_s$和张量标量比$r$确定的字段漂移$Δϕ$在通货膨胀。我们分析了可能的退化$Δϕ$通过比较三个广泛的类膨胀模型,与不同的依赖于e-折叠数$N$,基准模型的混沌膨胀单项式的潜力。所讨论的课程涵盖了大量的暴胀单场模型。我们发现,对于任何值的$(n_s, r)$的字段范围是不唯一确定的,可以有相同的预测混沌膨胀和一个非常不同的$Δϕ$。有趣的是,我们发现,字段范围不能超过一个上限,出现在不同类别的模型。最后,$Δϕ$甚至可以成为次普朗克,但这需要超越单场慢滚范式。

英文摘要:

We study to what extent the spectral index $n_s$ and the tensor-to-scalar ratio $r$ determine the field excursion $Δϕ$ during inflation. We analyse the possible degeneracy of $Δϕ$ by comparing three broad classes of inflationary models, with different dependence on the number of e-foldings $N$, to benchmark models of chaotic inflation with monomial potentials. The classes discussed cover a large set of inflationary single field models. We find that the field range is not uniquely determined for any value of $(n_s, r)$; one can have the same predictions as chaotic inflation and a very different $Δϕ$. Intriguingly, we find that the field range cannot exceed an upper bound that appears in different classes of models. Finally, $Δϕ$ can even become sub-Planckian, but this requires to go beyond the single-field slow-roll paradigm.

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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