Comprehensive analysis of the simplest curvaton model

被引：34

作者：

Byrnes, Christian T. ^{[1
]}

Cortes, Marina ^{[2
,3
,4
]}

Liddle, Andrew R. ^{[2
]}

机构：

[1] Univ Sussex, Ctr Astron, Brighton BN1 9QH, E Sussex, England

[2] Univ Edinburgh, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland

[3] Univ Lisbon, Fac Ciencias, Ctr Astron & Astrofisica, P-1769016 Lisbon, Portugal

[4] Perimeter Inst Theoret Phys, Waterloo, ON N2J 2Y5, Canada

来源：

PHYSICAL REVIEW D | 2014年 / 90卷 / 02期

基金：

英国科学技术设施理事会;

关键词：

D O I：

10.1103/PhysRevD.90.023523

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We carry out a comprehensive analysis of the simplest curvaton model, which is based on two noninteracting massive fields. Our analysis encompasses cases where the inflaton and curvaton both contribute to observable perturbations, and where the curvaton itself drives a second period of inflation. We consider both power spectrum and non-Gaussianity observables, and focus on presenting constraints in model parameter space. The fully curvaton-dominated regime is in some tension with observational data, while an admixture of inflaton-generated perturbations improves the fit. The inflating curvaton regime mimics the predictions of Nflation. Some parts of parameter space permitted by power spectrum data are excluded by non-Gaussianity constraints. The recent BICEP2 results [P. A. R. Ade et al. (BICEP2 Collaboration), Phys. Rev. Lett. 112, 241101 (2014)], if confirmed as of predominantly primordial origin, require that the inflaton perturbations provide a significant fraction of the total perturbation, ruling out the usual curvaton scenario in which the inflaton perturbations are negligible, though not the admixture regime where both inflaton and curvaton contribute to the spectrum.

引用

页数：8

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