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题名: Entropy perturbations in N-flation
作者: 蔡荣根 ;  Hu, Bin ;  Piao, Yun-Song
刊名: PHYSICAL REVIEW D
出版日期: 2009
卷号: 80, 期号:12, 页码:-
关键词: INFLATION
学科分类: Physics
通讯作者: Cai, RG , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, POB 2735, Beijing 100190, Peoples R China, Peoples R China
部门归属: [Cai, RG; Hu, B] Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China; [Piao, YS] Chinese Acad Sci, Grad Sch, Coll Phys Sci, Beijing 100049, Peoples R China
英文摘要: In this paper we study the entropy perturbations in N-flation by using the delta N formalism. We calculate the entropy corrections to the power spectrum of the overall curvature perturbation P(zeta). We obtain an analytic form of the transfer coefficient TRS(2), which describes the correlation between the curvature and entropy perturbations, and investigate its behavior numerically. It turns out that the entropy perturbations cannot be neglected in N-flation because the amplitude of entropy components is approximately in the same order as the adiabatic one at the end of inflation TRS(2)similar to O(1). The spectral index n(S) is calculated and it becomes smaller after the entropy modes are taken into account, i.e., the spectrum becomes redder, compared to the pure adiabatic case. Finally we study the modified consistency relation of N-flation, and find that the tensor-to-scalar ratio (r similar or equal to 0.006) is greatly suppressed by the entropy modes, compared to the pure adiabatic one (r similar or equal to 0.017) at the end of inflation.
资助者: National Natural Science Foundation of China[10535060, 10821504, 10975168,]; Ministry of Science and Technology of China[2010CB833004, 2010CB832800]; NSFC[10775180]; GUCAS
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000273233300036
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5202
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Cai, Rong-Gen,Hu, Bin,Piao, Yun-Song. Entropy perturbations in N-flation[J]. PHYSICAL REVIEW D,2009,80(12):-.
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