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arXiv 2102.04101hep-thastro-ph.COgr-qchep-ph
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准单场暴胀中的微扰么正性

Perturbative unitarity in quasi-single field inflation

Suro Kim, Toshifumi Noumi, Keito Takeuchi, Siyi Zhou

摘要:

我们研究了具有暴胀子和一个质量标量的准单场暴胀的微扰么正性的含义。分析高能散射,我们表明,非高斯性与$|f_{\rm NL}|\gtrsim1$不能实现,而不打开的相互作用,违反在高能量标度的么正性。然后,我们提供了一个$f_{\rm NL}$和新的物理,是紫外线完成所需的规模之间的关系。特别是在Hubble尺度$H\gtrsim 6\times 10^{9}$ GeV下,Planck压缩算符容易产生过大的非高斯性,如果不引入抑制量子引力修正的机制,很难实现成功的准单场暴胀.我们还将分析推广到等曲率模较重且暴胀动力学由暴胀子有效理论捕获的区域。在要求含有暴胀子和一个重标量的双标量UV模型具有微扰么正性的条件下,我们阐明了UV可由一个重标量完备的$P(X,ϕ)$模型的参数空间.

英文摘要:

We study implications of perturbative unitarity for quasi-single field inflation with the inflaton and one massive scalar. Analyzing high energy scattering, we show that non-Gaussianities with $|f_{\rm NL}|\gtrsim1$ cannot be realized without turning on interactions which violate unitarity at a high energy scale. Then, we provide a relation between $f_{\rm NL}$ and the scale of new physics that is required for UV completion. In particular we find that for the Hubble scale $H\gtrsim 6\times 10^{9}$ GeV, Planck suppressed operators can easily generate too large non-Gaussanities and so it is hard to realize successful quasi-single field inflation without introducing a mechanism to suppress quantum gravity corrections. Also we generalize the analysis to the regime where the isocurvature mode is heavy and the inflationary dynamics is captured by the inflaton effective theory. Requiring perturbative unitarity of the two-scalar UV models with the inflaton and one heavy scalar, we clarify the parameter space of the $P(X,ϕ)$ model which is UV completable by a single heavy scalar.

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