Acoustic signatures in the Cosmic Microwave Background bispectrum from primordial magnetic fields

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	Acoustic signatures in the Cosmic Microwave Background bispectrum from primordial magnetic fields
	Cai, Rong-Gen; Hu, Bin; Zhang, Hong-Bo; Cai, RG , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, POB 2735, Beijing 100190, Peoples R China
刊名	JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
	2010
期号	8 页码:-
关键词	Robertson-walker Perturbations Gauge-invariant Approach Anisotropy-probe Data Large-scale Structure Cosmological Perturbations Cmb Anisotropies Phase-transition Relativistic Cosmology Inflationary Universe String Cosmology
ISSN号	1475-7516
英文摘要	Using the full radiation transfer function, we numerically calculate the CMB angular bispectrum seeded by the compensated magnetic scalar density mode. We find that, for the string inspired primordial magnetic fields characterized by index n(B) = -2.9 and mean-field amplitude B(lambda) = 9 nG, the angular bispectrum is dominated by two primordial magnetic shapes. The first magnetic shape looks similar to the one from local-type primordial curvature perturbations, so both the amplitude and profile of the Komatsu-Spergel estimator (reduced bispectrum) seeded by this shape are almost the same as those of the primary CMB anisotropies. However, for different parameter sets (l(1), l(2)), this "local-type" reduced bispectrum oscillates around different asymptotic values in the high-l(3) regime because of the effect of the Lorentz force, which is exerted by the primordial magnetic fields on the charged baryons. This feature is different from the standard case where all modes approach to zero asymptotically in the high-l limit. On the other hand, the second magnetic shape appears only in the primordial magnetic field model. The amplitude of the Komatsu-Spergel estimator sourced by the second shape diverges in the low-l regime because of the negative slope of shape. In the high-l regime, this amplitude is approximately equal to that of the first estimator, but with a reversal phase.
学科主题	Physics
URL标识	查看原文
WOS记录号	WOS:000283575000015
公开日期	2012-08-02
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/5067]
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	Cai, RG , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, POB 2735, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Cai, Rong-Gen,Hu, Bin,Zhang, Hong-Bo,et al. Acoustic signatures in the Cosmic Microwave Background bispectrum from primordial magnetic fields[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2010(8):-.
APA	Cai, Rong-Gen,Hu, Bin,Zhang, Hong-Bo,&Cai, RG , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, POB 2735, Beijing 100190, Peoples R China.(2010).Acoustic signatures in the Cosmic Microwave Background bispectrum from primordial magnetic fields.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(8),-.
MLA	Cai, Rong-Gen,et al."Acoustic signatures in the Cosmic Microwave Background bispectrum from primordial magnetic fields".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .8(2010):-.