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Entropy perturbations in N-flation
Cai, Rong-Gen; Hu, Bin; Piao, Yun-Song; Cai, RG , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, POB 2735, Beijing 100190, Peoples R China, Peoples R China
2009
发表期刊PHYSICAL REVIEW D
ISSN1550-7998
卷号80期号:12页码:-
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.
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
关键词Inflation
学科领域Physics
资助者National Natural Science Foundation of China[10535060, 10821504, 10975168,]; Ministry of Science and Technology of China[2010CB833004, 2010CB832800]; NSFC[10775180]; GUCAS ; National Natural Science Foundation of China[10535060, 10821504, 10975168,]; Ministry of Science and Technology of China[2010CB833004, 2010CB832800]; NSFC[10775180]; GUCAS ; National Natural Science Foundation of China[10535060, 10821504, 10975168,]; Ministry of Science and Technology of China[2010CB833004, 2010CB832800]; NSFC[10775180]; GUCAS ; National Natural Science Foundation of China[10535060, 10821504, 10975168,]; Ministry of Science and Technology of China[2010CB833004, 2010CB832800]; NSFC[10775180]; GUCAS
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收录类别SCI
资助者National Natural Science Foundation of China[10535060, 10821504, 10975168,]; Ministry of Science and Technology of China[2010CB833004, 2010CB832800]; NSFC[10775180]; GUCAS ; National Natural Science Foundation of China[10535060, 10821504, 10975168,]; Ministry of Science and Technology of China[2010CB833004, 2010CB832800]; NSFC[10775180]; GUCAS ; National Natural Science Foundation of China[10535060, 10821504, 10975168,]; Ministry of Science and Technology of China[2010CB833004, 2010CB832800]; NSFC[10775180]; GUCAS ; National Natural Science Foundation of China[10535060, 10821504, 10975168,]; Ministry of Science and Technology of China[2010CB833004, 2010CB832800]; NSFC[10775180]; GUCAS
WOS记录号WOS:000273233300036
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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/311006/5202
专题理论物理所1978-2010年知识产出
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
推荐引用方式
GB/T 7714
Cai, Rong-Gen,Hu, Bin,Piao, Yun-Song,et al. Entropy perturbations in N-flation[J]. PHYSICAL REVIEW D,2009,80(12):-.
APA Cai, Rong-Gen,Hu, Bin,Piao, Yun-Song,&Cai, RG , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, POB 2735, Beijing 100190, Peoples R China, Peoples R China.(2009).Entropy perturbations in N-flation.PHYSICAL REVIEW D,80(12),-.
MLA Cai, Rong-Gen,et al."Entropy perturbations in N-flation".PHYSICAL REVIEW D 80.12(2009):-.
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