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题名: Acoustic signatures in the Cosmic Microwave Background bispectrum from primordial magnetic fields
作者: 蔡荣根 ;  Hu, Bin ;  Zhang, Hong-Bo
刊名: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
出版日期: 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
学科分类: Physics
通讯作者: Cai, RG , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, POB 2735, Beijing 100190, Peoples R China
部门归属: [Cai, RG; Hu, B; Zhang, HB] Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China
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.
资助者: National Natural Science Foundation of China[10947203, 10535060, 10821504, 10975168]; Ministry of Science and Technology of China[2010CB833004]
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000283575000015
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5067
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Cai, Rong-Gen,Hu, Bin,Zhang, Hong-Bo. Acoustic signatures in the Cosmic Microwave Background bispectrum from primordial magnetic fields[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2010(8):-.
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