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题名: Testing gravity with non-Gaussianity
作者: Gao, X
刊名: PHYSICS LETTERS B
出版日期: 2011
卷号: 702, 期号:4, 页码:197-200
关键词: GRAVITATIONAL PERTURBATIONS ;  EVOLUTION
学科分类: Physics
通讯作者: Gao, X (reprint author), Univ Paris 07, CNRS, APC, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, France.
部门归属: [Gao, Xian] Univ Paris 07, CNRS, APC, F-75205 Paris 13, France; [Gao, Xian] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China; [Gao, Xian] Ecole Normale Super, Phys Theor Lab, F-75231 Paris 05, France; [Gao, Xian] Inst Astrophys, F-75014 Paris, France
英文摘要: We show that modified gravity presents distinctive nonlinear features on the Cosmic Microwave Background (CMB) anisotropies comparing with General Relativity (GR). We calculate the contribution to the CMB non-Gaussianity from nonlinear Sachs-Wolfe effect in f (R) gravity and show that, contrary to GR's contribution which is typically less than or similar to O(1), the contribution in f (R) gravity is sensitive to the nonlinear structure of f (R) and can be large in principle. Optimistically, this gives an alternative origin for the possibly observed large CMB non-Gaussianities besides the primordial ones. On the other hand, such nonlinear features can be employed to provide a new cosmological test of f (R) or other modified theories of gravitation, which is unique and independent of previously known tests. (C) 2011 Elsevier B.V. All rights reserved.
资助者: NSFC [10535060/A050207]; NSFC group [10821504]; Ministry of Science and Technology [2007CB815401]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000295348100003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/14289
Appears in Collections:理论物理所2011年知识产出_期刊论文

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Recommended Citation:
Gao, X. Testing gravity with non-Gaussianity[J]. PHYSICS LETTERS B,2011,702(4):197-200.
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