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题名: Can relic superhorizon inhomogeneities be responsible for large-scale CMB anomalies?
作者: Gao, X
刊名: PHYSICS LETTERS B
出版日期: 2011
卷号: 702, 期号:1, 页码:12-15
关键词: CHAOTIC INFLATIONARY UNIVERSE ;  INITIAL CONDITIONS ;  ANISOTROPY ;  PERTURBATIONS
学科分类: Physics
通讯作者: Gao, X (reprint author), Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, 55 Zhong Guan Cun E Rd, Beijing 100080, Peoples R China.
部门归属: Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100080, Peoples R China
英文摘要: We investigate the effects of the presence of relic classical superhorizon inhomogeneities during inflation. This superhorizon inhomogeneity appears as a gradient locally and picks out a preferred direction. Quantum fluctuations on this slightly inhomogeneous background are generally statistical anisotropic. We find a quadrupole modification to the ordinary isotropic spectrum. Moreover, this deviation from statistical isotropy is scale-dependent, with a similar to -1/k(2) factor. This result implies that the statistical anisotropy mainly appears on large scales, while the spectrum on small scales remains highly isotropic. Moreover, due to this -1/k(2) factor, the power on large scales is suppressed. Thus, our model can simultaneously explain the observed anisotropic alignments of the low-l multipoles and their low power. (C) 2011 Elsevier B.V All rights reserved.
资助者: NSFC
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000294142600003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/14296
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Recommended Citation:
Gao, X. Can relic superhorizon inhomogeneities be responsible for large-scale CMB anomalies?[J]. PHYSICS LETTERS B,2011,702(1):12-15.
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