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题名: Cosmological observables in multi-field inflation with a non-flat field space
作者: Gao, X ;  Li, TJ ;  Shukla, P
刊名: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
出版日期: 2014
期号: 10, 页码:8
关键词: MULTICOMPONENT INFLATON ;  SCALAR RATIO ;  SPECTRUM ;  UNIVERSE ;  2ND-ORDER ;  SCENARIO ;  FLATNESS ;  FORMULA ;  HORIZON ;  MODELS
学科分类: Physics
DOI: 10.1088/1475-7516/2014/10/008
通讯作者: Gao, X (reprint author), Chinese Acad Sci, State Key Lab Theoret Phys, Inst Theoret Phys, Beijing 100190, Peoples R China.
部门归属: [Gao, Xin ;  Li, Tianjun] Chinese Acad Sci, State Key Lab Theoret Phys, Inst Theoret Phys, Beijing 100190, Peoples R China ;  [Gao, Xin ;  Li, Tianjun] Chinese Acad Sci, Kavli Inst Theoret Phys China, Inst Theoret Phys, Beijing 100190, Peoples R China ;  [Gao, Xin] Virginia Tech, Dept Phys, Blacksburg, VA 24061 USA ;  [Li, Tianjun] Univ Elect Sci & Technol China, Sch Phys Elect, Chengdu 610054, Peoples R China ;  [Shukla, Pramod] Univ Turin, Dipartimento Fis, I-10125 Turin, Italy ;  [Shukla, Pramod] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy
英文摘要: Using delta N formalism in the context of a generic multi-field inflation driven on a non-flat field space background, we revisit the analytic expressions of the various cosmological observables such as scalar tensor power spectra, scalar/tensor spectral tilts, non-Gaussianity parameters, tensor-to-scalar ratio, and the various runnings of these observables. In our backward formalism approach, the subsequent expressions of observables automatically include the terms beyond the leading order slow-roll expansion correcting many of the expression at subleading order. To connect our analysis properly with the earlier results, we rederive the (well) known (single field) expressions in the limiting cases of our generic formulae. Further, in the light of PLANCK results, we examine for the compatibility of the consistency relations within the slow-roll regime of a two-field roulette poly-instanton inflation realized in the context, of large volume scenarios.
资助者: Natural Science Foundation of China [10821504, 11075194, 11135003, 11275246]; National Basic Research Program of China (973 Program) [201003833000]; Compagnia di San Paolo contract "Modern Application of String Theory" (MAST) [TO-Ca113-2012-0088]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000345990800009
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15628
Appears in Collections:理论物理所2014年知识产出 _期刊论文

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Recommended Citation:
Gao, X,Li, TJ,Shukla, P. Cosmological observables in multi-field inflation with a non-flat field space[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2014(10):8.
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