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

被引：62

作者：

Bartolo, Nicola ^{[1
,2
]}

Cannone, Dario ^{[1
,2
]}

Ricciardone, Angelo ^{[3
]}

Tasinato, Gianmassimo ^{[4
]}

机构：

[1] Univ Padua, Dipartimento Fis & Astron G Galilei, Via Marzolo 8, I-35131 Padua, Italy

[2] Ist Nazl Fis Nucl, Sez Padova, Via Marzolo 8, I-35131 Padua, Italy

[3] Univ Stavanger, Fac Sci & Technol, N-4036 Stavanger, Norway

[4] Swansea Univ, Dept Phys, Swansea SA2 8PP, W Glam, Wales

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2016年 / 03期

关键词：

cosmological perturbation theory; inflation; non-gaussianity; primordial gravitational waves (theory);

D O I：

10.1088/1475-7516/2016/03/044

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：31

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