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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
Entropy perturbations in N-flation
Source PublicationPHYSICAL REVIEW D
KeywordInflation
AbstractIn 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.
2009
ISSN1550-7998
Volume80Issue:12Pages:-
Subject AreaPhysics
Indexed BySCI
Funding OrganizationNational 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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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/5202
Collection理论物理所科研产出_SCI论文
Corresponding AuthorCai, RG , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, POB 2735, Beijing 100190, Peoples R China, Peoples R China
Recommended Citation
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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