Non-Gaussianity in the curvaton scenario

被引:200
作者
Bartolo, N [1 ]
Matarrese, S
Riotto, A
机构
[1] Univ Sussex, Ctr Astron, Brighton BN1 9QJ, E Sussex, England
[2] Univ Padua, Dept Phys, I-35131 Padua, Italy
[3] Univ Padua, Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy
来源
PHYSICAL REVIEW D | 2004年 / 69卷 / 04期
关键词
D O I
10.1103/PhysRevD.69.043503
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Since a positive future detection of nonlinearity in the cosmic microwave background anisotropy pattern might allow us to descriminate among different mechanisms giving rise to cosmological adiabatic perturbations, we study the evolution of the second-order cosmological curvature perturbation on superhorizon scales in the curvaton scenario. We provide the exact expression for the non-Gaussianity in the primordial perturbations including gravitational second-order corrections which are particularly relevant in the case in which the curvaton dominates the energy density before it decays. As a by-product, we show that in the standard scenario where cosmological curvature perturbations are induced by the inflaton field, the second-order curvature perturbation is conserved even during the reheating stage after inflation.
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页数:7
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