Constraining Axion Inflation with Gravitational Waves across 29 Decades in Frequency

被引：64

作者：

Adshead, Peter ^{[1
]}

Giblin, John T., Jr. ^{[2
,3
]}

Pieroni, Mauro ^{[4
,5
,6
]}

Weiner, Zachary J. ^{[1
]}

机构：

[1] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[2] Kenyon Coll, Dept Phys, Gambier, OH 43022 USA

[3] Case Western Reserve Univ, Dept Phys, CERCA ISO, Cleveland, OH 44106 USA

[4] UAM, Inst Fis Teor, CSIC, Calle Nicolas Cabrera 13-15, E-28049 Madrid, Spain

[5] Univ Autonoma Madrid, Dept Fis Teor, Campus Cantoblanco, E-28049 Madrid, Spain

[6] Imperial Coll, Theoret Phys, Blackett Lab, London SW7 2AZ, England

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 124卷 / 17期

基金：

美国国家科学基金会; 美国能源部; 欧盟地平线“2020”;

关键词：

Gravity waves;

D O I：

10.1103/PhysRevLett.124.171301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We demonstrate that gravitational waves generated by efficient gauge preheating after axion inflation generically contribute significantly to the effective number of relativistic degrees of freedom N-eff. We show that, with existing Planck limits, gravitational waves from preheating already place the strongest constraints on the inflaton's possible axial coupling to Abelian gauge fields. We demonstrate that gauge preheating can completely reheat the Universe regardless of the inflationary potential. Further, we quantify the variation of the efficiency of gravitational wave production from model to model and show that it is correlated with the tensor-to-scalar ratio. In particular, when combined with constraints on models whose tensor-to-scalar ratios would be detected by next-generation cosmic microwave background experiments, r greater than or similar to 10(-3), constraints from N-eff will probe or rule out the entire coupling regime for which gauge preheating is efficient.

引用

页数：6

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