Can relic superhorizon inhomogeneities be responsible for large-scale CMB anomalies?

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	Can relic superhorizon inhomogeneities be responsible for large-scale CMB anomalies?
	Gao, X; 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.
	2011
发表期刊	PHYSICS LETTERS B
ISSN	0370-2693
卷号	702 期号:1 页码:12-15
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.
部门归属	Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100080, Peoples R China
关键词	Chaotic Inflationary Universe Initial Conditions Anisotropy Perturbations
学科领域	Physics
资助者	NSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC
URL	查看原文
收录类别	SCI
语种	英语
资助者	NSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC
WOS记录号	WOS:000294142600003
引用统计	被引频次：7[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.itp.ac.cn/handle/311006/14296
专题	理论物理所SCI论文
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.
推荐引用方式 GB/T 7714	Gao, X,Gao, X . Can relic superhorizon inhomogeneities be responsible for large-scale CMB anomalies?[J]. PHYSICS LETTERS B,2011,702(1):12-15.
APA	Gao, X,&Gao, X .(2011).Can relic superhorizon inhomogeneities be responsible for large-scale CMB anomalies?.PHYSICS LETTERS B,702(1),12-15.
MLA	Gao, X,et al."Can relic superhorizon inhomogeneities be responsible for large-scale CMB anomalies?".PHYSICS LETTERS B 702.1(2011):12-15.

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