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题名: New features in the curvaton model
作者: Chingangbam, P ;  Huang, QG
刊名: PHYSICAL REVIEW D
出版日期: 2011
卷号: 83, 期号:2, 页码:23527
关键词: INFLATIONARY UNIVERSE ;  NON-GAUSSIANITY ;  PERTURBATIONS ;  HORIZON
学科分类: Physics
通讯作者: Chingangbam, P (reprint author), Indian Inst Astrophys, Koramangala 2 Block, Bangalore 560034, Karnataka, India.
部门归属: [Chingangbam, Pravabati] Sejong Univ, Astrophys Res Ctr Struct & Evolut Cosmos, Seoul 143747, South Korea; [Huang, Qing-Guo] Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China
英文摘要: We demonstrate novel features in the behavior of the second-and third-order nonlinearity parameters of the curvature perturbation, namely f(NL) and g(NL), arising from nonlinear motion of the curvaton field. We investigate two classes of potentials for the curvaton-the first has tiny oscillations superimposed upon the quadratic potential. The second is characterized by a single "feature'' separating two quadratic regimes with different mass scales. The feature may either be a bump or a flattening of the potential. In the case of the oscillatory potential, we find that, as the width and height of superimposed oscillations increase, both f(NL) and g(NL) deviate strongly from their expected values from a quadratic potential. f(NL) changes sign from positive to negative as the oscillations in the potential become more prominent. Hence, this model can be severely constrained by convincing evidence from observations that f(NL) is positive. g(NL), on the other hand, acquires very large negative values. Further, this model can give rise to a large running of f(NL), with respect to scale. For the single-feature potential, we find that f(NL) and g(NL) exhibit oscillatory behavior as a function of the parameter that controls the feature. The running of f(NL) with respect to scale is found to be small.
资助者: Korean government (MEST) [2009-0062868]; Chinese Academy of Sciences under the National Science Foundation of China [10975167]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000286804600001
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/14430
Appears in Collections:理论物理所2011年知识产出_期刊论文

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Recommended Citation:
Chingangbam, P,Huang, QG. New features in the curvaton model[J]. PHYSICAL REVIEW D,2011,83(2):23527.
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