Non-Gaussianity from preheating -: art. no. 161301

被引：114

作者：

Enqvist, K

Jokinen, A

Mazumdar, A

Multamäki, T

Väihkönen, A

机构：

[1] Univ Helsinki, Helsinki Inst Phys, FIN-00014 Helsinki, Finland

[2] NORDITA, DK-2100 Copenhagen, Denmark

[3] Univ Helsinki, Dept Phys Sci, FIN-00014 Helsinki, Finland

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 16期

关键词：

D O I：

10.1103/PhysRevLett.94.161301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We consider a two-field model for inflation where the second order metric perturbations can be amplified by a parametric resonance during preheating. We demonstrate that there can arise a considerable enhancement of non-Gaussianity sourced by the local terms generated through the coupled perturbations. We argue that the non-Gaussianity parameter could be as large as f(NL)approximate to 50. Our results may provide a useful test of preheating in future cosmic microwave background experiments.

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页数：4

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