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arXiv 1703.08309hep-thgr-qchep-ph
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非最小耦合标量场的跨普朗克量子修正和暴胀真空涨落

Trans-Planckian quantum corrections and inflationary vacuum fluctuations of non-minimally coupled scalar fields

Hiroki Matsui

摘要:

在本文中,我们讨论了trans-Planckian物理如何影响暴胀真空涨落和原始密度扰动。暴胀过程中的跨普朗克问题已经在文献中得到了广泛的讨论,但仍存在争议。我们利用非最小耦合标量场的两点关联函数,通过绝热正则化或近似构造有效势,重新考虑了这个问题。首先,我们清楚地表明,在合理的假设下,量子涨落的截止发散在暴胀期间不会发生剧烈变化,并且修正可以嵌入标准有效势中。因此,紫外光对原始密度扰动的影响很好地转化为有效势。然后,我们从暴胀涨落中找出修正的有效势,并说明在暴胀过程中,trans-Planckian修正或UV修正是如何改变有效势的。我们清楚地表明,新的物理强烈影响的通货膨胀过程中的通货膨胀潜力,我们得到了通货膨胀的约束$Λ_{\rm UV} \ll H/g^{1/2}$,其中$g$是在紫外尺度$Λ_{\rm UV}$的相互作用耦合。

英文摘要:

In the present paper we discuss how trans-Planckian physics affects inflationary vacuum fluctuations and primordial density perturbations. The trans-Planckian problem during inflation has been widely discussed in literature, but it is still under debate. We reconsider this problem by using the two-point correlation function of the non-minimally coupled scalar fields and constructing the effective potential with the adiabatic (WKB) regularization or approximation. First, we clearly show that the cut-off divergence of the quantum fluctuations does not drastically change during inflation under reasonable assumptions and the corrections can be embedded in standard effective potential. Thus, the UV effects on the primordial density perturbation are well translated into the effective potential. Then, we find out the modified effective potential from the inflationary fluctuations and show how the trans-Planckian or UV corrections change the potential during inflation. We clearly show that the new physics strongly affects the inflation potential during inflation and we obtain a inflationary constraint $Λ_{\rm UV} \ll H/g^{1/2}$ where $g$ is the interaction coupling at the UV scale $Λ_{\rm UV}$.

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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