Distinctive signatures of space-time diffeomorphism breaking in EFT of inflation

Distinctive signatures of space-time diffeomorphism breaking in EFT of inflation
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暴胀 EFT 中时空微分同胚断裂的独特特征

DOI:
10.1088/1475-7516/2016/03/044
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发表时间:
2016
影响因子:
6.4
通讯作者:
Bartolo N
Bartolo N
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Bartolo N

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暴胀的有效场论是一个强有力的工具,用于获得与大类暴胀模型共同的模型无关的预测。它只需要暴胀时代对称性被打破的信息,以及驱动暴胀的场的数量和性质。在本文中,我们考虑的情况下,同时打破时间reparameterization和空间同胚在通货膨胀。我们研究如何分析这样的系统使用有效的场论方法,我们讨论了几个观测结果的统计标量和张量模式。例如,检查的三个点函数,我们表明,这种对称性破缺模式可以导致压缩双谱的振幅增强,和他们的三个波矢之间的一个独特的角度依赖。我们还讨论了如何我们的结果表明,在通货膨胀的限制水平的空间超同态打破的前景。
The effective field theory of inflation is a powerful tool for obtaining model independent predictions common to large classes of inflationary models. It requires only information about the symmetries broken during the inflationary era, and on the number and nature of fields that drive inflation. In this paper, we consider the case for scenarios that simultaneously break time reparameterization and spatial diffeomorphisms during inflation. We examine how to analyse such systems using an effective field theory approach, and we discuss several observational consequences for the statistics of scalar and tensor modes. For example, examining the three point functions, we show that this symmetry breaking pattern can lead to an enhanced amplitude for the squeezed bispectra, and to a distinctive angular dependence between their three wavevectors. We also discuss how our results indicate prospects for constraining the level of spatial diffeomorphism breaking during inflation.
DOI: 10.1088/1475-7516/2008/01/015
发表时间: 2007-11
影响因子: 6.4
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