Scale-invariance as the origin of dark radiation?

被引：34

作者：

Gorbunov, Dmitry ^{[1
,2
]}

Tokareva, Anna ^{[1
,3
]}

机构：

[1] Russian Acad Sci, Nucl Res Inst, Moscow 117312, Russia

[2] Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Russia

[3] Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119991, Russia

来源：

PHYSICS LETTERS B | 2014年 / 739卷

关键词：

R-2-INFLATION; MATTER;

D O I：

10.1016/j.physletb.2014.10.036

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recent cosmological data favor R-2-inflation and some amount of non-standard dark radiation in the Universe. We show that a framework of high energy scale invariance can explain these data. The spontaneous breaking of this symmetry provides gravity with the Planck mass and particle physics with the electroweak scale. We found that the corresponding massless Nambu-Goldstone bosons - dilatons - are produced at reheating by the inflaton decay right at the amount needed to explain primordial abundances of light chemical elements and anisotropy of the cosmic microwave background. Then we extended the discussion on the interplay with Higgs-inflation and on general class of inflationary models where dilatons are allowed and may form the dark radiation. As a result we put a lower limit on the reheating temperature in a general scale invariant model of inflation. (C) 2014 The Authors. Published by Elsevier B.V.

引用

页码：50 / 55

页数：6

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