Non-Gaussianity from broken symmetries

被引：26
作者：
Kolb, EW
Riotto, A
Vallinotto, A
机构：
[1] Fermilab Natl Accelerator Lab, Ctr Particle Astrophys, Batavia, IL 60510 USA
[2] Univ Chicago, Enrico Fermi Inst, Dept Astron & Astrophys, Chicago, IL 60637 USA
[3] CERN, Div Theory, CH-1211 Geneva, Switzerland
[4] Univ Chicago, Dept Phys, Chicago, IL 60637 USA
来源：
PHYSICAL REVIEW D | 2006年 / 73卷 / 02期
关键词：
D O I：
10.1103/PhysRevD.73.023522
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Recently we studied inflation models in which the inflaton potential is characterized by an underlying approximate global symmetry. In the first work we pointed out that in such a model curvature perturbations are generated after the end of the slow-roll phase of inflation. In this work we develop further the observational implications of the model and compute the degree of non-Gaussianity predicted in the scenario. We find that the corresponding nonlinearity parameter, f(NL), can be as large as 10(2).
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