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arXiv 1302.2637astro-ph.COgr-qchep-ph
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暴胀过程中旁观者场的宇宙学扰动

Cosmological perturbations from a Spectator field during inflation

Lingfei Wang, Anupam Mazumdar

摘要:

在本文中,我们将分析讨论从一个缓慢滚动的次优势观众场,衰变之前的通货膨胀结束的扰动。这样一个观众场的量子涨落可以在非常大的尺度上产生扰动,并解释具有中等非高斯性的宇宙微波背景辐射中的温度各向异性,只要相关模式在观众缓慢滚动时离开哈勃补丁。此外,扰动是纯粹的{ \it绝热},因为暴胀子衰变占主导地位,并创建所有的标准模型自由度。我们将提供两个例子的观众场潜力,一个与阶跃函数的轮廓,和其他的拐点。在这两种情况下,我们将计算高阶曲率扰动,即局部双谱和三谱,这可以由即将到来的普朗克数据的约束。

英文摘要:

In this paper we will discuss analytically the perturbations created from a slowly rolling subdominant spectator field which decays much before the end of inflation. The quantum fluctuations of such a spectator field can seed perturbations on very large scales and explain the temperature anisotropy in the cosmic microwave background radiation with moderate non-Gaussianity, provided the relevant modes leave the Hubble patch while the spectator is slowly rolling. Furthermore, the perturbations are purely {\it adiabatic} since the inflaton decay dominates and creates all the Standard Model degrees of freedom. We will provide two examples for the spectator field potential, one with a step function profile, and the other with an inflection point. In both the cases we will compute higher order curvature perturbations, i.e.\ local bispectrum and trispectrum, which can be constrained by the forthcoming Planck data.

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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