期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 3, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2016/03/044
关键词
cosmological perturbation theory; inflation; non-gaussianity; primordial gravitational waves (theory)
资金
- ASI/INAF [I/072/09/0]
- STFC Advanced Fellowship [ST/H005498/1]
- Science and Technology Facilities Council [ST/L000369/1, ST/H005498/1] Funding Source: researchfish
- STFC [ST/H005498/1, ST/L000369/1] Funding Source: UKRI
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据