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Inflation with multiple sound speeds: A model of multiple DBI type actions and non-Gaussianities
Cai YF(蔡一夫); Cai, YF; Xia, HY
2009
发表期刊PHYSICS LETTERS B
卷号677期号:5页码:#REF!
通讯作者Cai, YF (reprint author), Chinese Acad Sci, Inst High Energy Phys, POB 918-4, Beijing 100049, Peoples R China.
文章类型Review
摘要In this Letter we study adiabatic and isocurvature perturbations in the frame of inflation with multiple sound speeds involved. We suggest this scenario can be realized by a number of generalized scalar fields with arbitrary kinetic forms. These scalars have their own sound speeds respectively, so the propagations of field fluctuations are individual. Specifically, we study a model constructed by two DBI type actions. We find that the critical length scale for the freezing of perturbations corresponds to the maximum sound horizon. Moreover, if the mass term of one field is much lighter than that of the other, the entropy perturbation could be quite large and so may give rise to a growth outside sound horizon. At cubic order, we find that the non-Gaussianity of local type is possibly large when entropy perturbations are able to convert into curvature perturbations. We also calculate the non-Gaussianity of equilateral type approximately. (C) 2009 Elsevier B.V. All rights reserved.
学科领域Physics
DOI10.1016/j.physletb.2009.05.047
收录类别SCI
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000267729900002
引用统计
被引频次:78[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/227055
专题理论物理室
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GB/T 7714
Cai YF,Cai, YF,Xia, HY. Inflation with multiple sound speeds: A model of multiple DBI type actions and non-Gaussianities[J]. PHYSICS LETTERS B,2009,677(5):#REF!.
APA 蔡一夫,Cai, YF,&Xia, HY.(2009).Inflation with multiple sound speeds: A model of multiple DBI type actions and non-Gaussianities.PHYSICS LETTERS B,677(5),#REF!.
MLA 蔡一夫,et al."Inflation with multiple sound speeds: A model of multiple DBI type actions and non-Gaussianities".PHYSICS LETTERS B 677.5(2009):#REF!.
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