Scale-dependent gravitational waves from a rolling axion

被引：164

作者：

Namba, Ryo ^{[1
]}

Peloso, Marco ^{[2
,3
]}

Shiraishi, Maresuke ^{[1
]}

Sorbo, Lorenzo ^{[4
]}

Unal, Caner ^{[2
,3
]}

机构：

[1] Univ Tokyo, Inst Adv Study, Kavli Inst Phys & Math Universe WPI, Kashiwa, Chiba 2778583, Japan

[2] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

[3] Univ Minnesota, Minnesota Inst Astrophys, Minneapolis, MN 55455 USA

[4] Univ Massachusetts, Dept Phys, Amherst Ctr Fundamental Interact, Amherst, MA 01003 USA

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2016年 / 01期

基金：

美国国家科学基金会;

关键词：

ation; primordial gravitational waves (theory); cosmological perturbation theory; PRIMORDIAL NON-GAUSSIANITY; POLARIZATION ANISOTROPIES; FAST ESTIMATOR; MICROWAVE; INFLATION; TEMPERATURE; PHYSICS;

D O I：

10.1088/1475-7516/2016/01/041

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We consider a model in which a pseudo-scalar field sigma rolls for some e-folds during inflation, sourcing one helicity of a gauge field. These fields are only gravitationally coupled to the inflaton, and therefore produce scalar and tensor primordial perturbations only through gravitational interactions. These sourced signals are localized on modes that exit the horizon while the roll of sigma is significant. We focus our study on cases in which the model can simultaneously produce (i) a large gravitational wave signal, resulting in observable B-modes of the CMB polarizations, and (ii) sufficiently small scalar perturbations, so to be in agreement with the current limits from temperature anisotropies. Different choices of parameters can instead lead to a localized and visible departure from gaussianity in the scalar sector, either at CMB or LSS scales.

引用

页数：44

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