On degenerate models of cosmic inflation
On degenerate models of cosmic inflation
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DOI：
10.1088/1475-7516/2014/10/005
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发表时间：
2014-06
影响因子：
6.4
通讯作者：
R. Gwyn;G. Palma;M. Sakellariadou;Spyros Sypsas
中科院分区：
文献类型：
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作者：
R. Gwyn;G. Palma;M. Sakellariadou;Spyros Sypsas
在这篇文章中，我们讨论了当前和未来的CMB测量在确定导致原始曲率扰动产生的暴涨模型方面的作用。通过考虑由重场引起的具有修正色散关系的有效膨胀场论的参数化，我们导出了宇宙学可观测量对重物理ΛUV尺度的依赖关系。具体地说，我们展示了FNL非线性参数与视界出口处曲率扰动的相速度之间的关系，该相速度是由ΛUV参数化的。BICEP2和普朗克的发现与ΛUV∼ΛGut的值一致。然而，我们在膨胀模型的参数空间中发现了一个简并性，只有在对非高斯双谱的形状有详细了解的情况下才能解决这个问题。
In this article we discuss the role of current and future CMB measurements in pinning down the model of inflation responsible for the generation of primordial curvature perturbations. By considering a parameterization of the effective field theory of inflation with a modified dispersion relation arising from heavy fields, we derive the dependence of cosmological observables on the scale of heavy physics ΛUV. Specifically, we show how the fNL non-linearity parameters are related to the phase velocity of curvature perturbations at horizon exit, which is parameterized by ΛUV. BICEP2 and PLANCK findings are shown to be consistent with a value ΛUV ∼ ΛGUT. However, we find a degeneracy in the parameter space of inflationary models that can only be resolved with a detailed knowledge of the shape of the non-Gaussian bispectrum.