Influence of super-horizon modes on correlation functions during inflation
Influence of super-horizon modes on correlation functions during inflation
复制标题
暴胀过程中超视距模态对相关函数的影响
DOI：
10.1088/1475-7516/2018/05/022
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发表时间：
2018
影响因子：
6.4
通讯作者：
Deutsch, Anne-Sylvie
中科院分区：
文献类型：
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作者：
Deutsch, Anne-Sylvie
次哈勃模式和超哈勃模式之间的耦合会影响我们宇宙的局部观测统计。在准单场暴胀的背景下，我们可以计算相关函数，并推导出这些不可观测的模式对观测到的相关函数以及推断的宇宙学参数的影响。我们研究了不同类别的图如何影响双谱的压缩极限，特别是，而接触式图离开的长模式和短模式之间的缩放不变，交换式图修改的形状的双谱。我们表明，隐藏的扇形场的质量，因此可以由一个不可避免的宇宙方差，可以达到脚本O（10%）的1-σ不确定性的弱非高斯宇宙的偏见。最后，我们超越了双谱，并展示了不可观测和可观测模式之间的耦合如何影响具有任意阶非导数自相互作用的通用相关函数。
Coupling between sub-and super-Hubble modes can affect the locally observed statistics of our universe. In the context of Quasi-Single Field Inflation, we can compute correlation functions and derive the influence of those unobservable modes on observed correlation functions as well as on the inferred cosmological parameters. We study how different classes of diagrams affect the bispectrum in the squeezed limit; in particular, while contact-like diagrams leave the scaling between the long and short modes unchanged, exchange-like diagrams do modify the shape of the bispectrum. We show that the mass of the hidden sector field can hence be biased by an unavoidable cosmic variance that can reach a 1-σ uncertainty of Script O (10%) for a weakly non-Gaussian universe. Finally, we go beyond the bispectrum and show how couplings between unobservable and observable modes can affect generic correlation functions with arbitrary order non-derivative self-interactions.