中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
On cross-correlations between curvature and isocurvature perturbations during inflation

文献类型:期刊论文

作者Gao, X , Chinese Acad Sci, Key Lab Frontiers Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China; Gao, Xian
刊名JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
出版日期2010
期号2页码:-
关键词Density Perturbations Spectra
ISSN号1475-7516
英文摘要We investigate the effects of couplings between curvature and isocurvature perturbations before and around horizon-crossings during cosmological inflation. We consider a generalized two-field inflation model, in which the non-canonical kinetic term allows us arbitrary sound speeds of curvature and isocurvature perturbations. By using the field-theoretical perturbative analysis, we calculate the cross-spectrum between curvature and isocurvature perturbations and the corrections to curvature and isocurvature power spectra due to the presence of couplings between them. Our analysis confirms previous results that the cross-correlations are generated and amplified when perturbations cross the horizons. Moreover, we find the cross-correlation, which was previously shown to be first-order in slow-roll parameter, can be enhanced when the sound speed of curvature perturbation is much larger than that of the isocurvature perturbation. This is because in this case the isocurvature perturbation exits its horizon much earlier than the curvature perturbation and acts as a nearly constant source on the curvature perturbation.
学科主题Physics
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WOS记录号WOS:000276102300016
公开日期2012-08-02
源URL[http://ir.itp.ac.cn/handle/311006/5171]  
专题理论物理研究所_理论物理所1978-2010年知识产出
通讯作者Gao, X , Chinese Acad Sci, Key Lab Frontiers Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China
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Gao, X , Chinese Acad Sci, Key Lab Frontiers Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China,Gao, Xian. On cross-correlations between curvature and isocurvature perturbations during inflation[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2010(2):-.
APA Gao, X , Chinese Acad Sci, Key Lab Frontiers Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China,&Gao, Xian.(2010).On cross-correlations between curvature and isocurvature perturbations during inflation.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(2),-.
MLA Gao, X , Chinese Acad Sci, Key Lab Frontiers Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China,et al."On cross-correlations between curvature and isocurvature perturbations during inflation".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .2(2010):-.

入库方式: OAI收割

来源:理论物理研究所

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