ITP OpenIR  > 2011年知识产出
New features in the curvaton model
Chingangbam, P; Huang, QG; Chingangbam, P (reprint author), Indian Inst Astrophys, Koramangala 2 Block, Bangalore 560034, Karnataka, India.
2011
发表期刊PHYSICAL REVIEW D
ISSN1550-7998
卷号83期号:2页码:23527
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.
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
关键词Inflationary Universe Non-gaussianity Perturbations Horizon
学科领域Physics
资助者Korean government (MEST) [2009-0062868]; Chinese Academy of Sciences under the National Science Foundation of China [10975167] ; Korean government (MEST) [2009-0062868]; Chinese Academy of Sciences under the National Science Foundation of China [10975167] ; Korean government (MEST) [2009-0062868]; Chinese Academy of Sciences under the National Science Foundation of China [10975167] ; Korean government (MEST) [2009-0062868]; Chinese Academy of Sciences under the National Science Foundation of China [10975167]
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收录类别SCI
语种英语
资助者Korean government (MEST) [2009-0062868]; Chinese Academy of Sciences under the National Science Foundation of China [10975167] ; Korean government (MEST) [2009-0062868]; Chinese Academy of Sciences under the National Science Foundation of China [10975167] ; Korean government (MEST) [2009-0062868]; Chinese Academy of Sciences under the National Science Foundation of China [10975167] ; Korean government (MEST) [2009-0062868]; Chinese Academy of Sciences under the National Science Foundation of China [10975167]
WOS记录号WOS:000286804600001
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被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/14430
专题2011年知识产出
通讯作者Chingangbam, P (reprint author), Indian Inst Astrophys, Koramangala 2 Block, Bangalore 560034, Karnataka, India.
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Chingangbam, P,Huang, QG,Chingangbam, P . New features in the curvaton model[J]. PHYSICAL REVIEW D,2011,83(2):23527.
APA Chingangbam, P,Huang, QG,&Chingangbam, P .(2011).New features in the curvaton model.PHYSICAL REVIEW D,83(2),23527.
MLA Chingangbam, P,et al."New features in the curvaton model".PHYSICAL REVIEW D 83.2(2011):23527.
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