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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
2010
发表期刊JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
ISSN1475-7516
期号8页码:-
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.
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
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
学科领域Physics
资助者National Natural Science Foundation of China[10947203, 10535060, 10821504, 10975168]; Ministry of Science and Technology of China[2010CB833004] ; National Natural Science Foundation of China[10947203, 10535060, 10821504, 10975168]; Ministry of Science and Technology of China[2010CB833004] ; National Natural Science Foundation of China[10947203, 10535060, 10821504, 10975168]; Ministry of Science and Technology of China[2010CB833004] ; National Natural Science Foundation of China[10947203, 10535060, 10821504, 10975168]; Ministry of Science and Technology of China[2010CB833004]
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收录类别SCI
资助者National Natural Science Foundation of China[10947203, 10535060, 10821504, 10975168]; Ministry of Science and Technology of China[2010CB833004] ; National Natural Science Foundation of China[10947203, 10535060, 10821504, 10975168]; Ministry of Science and Technology of China[2010CB833004] ; National Natural Science Foundation of China[10947203, 10535060, 10821504, 10975168]; Ministry of Science and Technology of China[2010CB833004] ; National Natural Science Foundation of China[10947203, 10535060, 10821504, 10975168]; Ministry of Science and Technology of China[2010CB833004]
WOS记录号WOS:000283575000015
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被引频次:26[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/311006/5067
专题理论物理所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
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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):-.
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