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Stochastic fluctuations in the primeval plasma of the universe
Fang, LZ; Huang, Z; Wu, XP
1996-10-01
发表期刊INTERNATIONAL JOURNAL OF MODERN PHYSICS D
卷号5期号:5页码:495-506
摘要Before recombination of the universe the cosmic ''fluid'' consisting of primeval plasma and radiation cannot be perfect, but necessarily possesses nonvanishing dissipations. The subhorizon evolution of density perturbations in the radiation-plasma system must be described by stochastic kinetic theories. Both the dissipation and stochastic fluctuation in the coupled radiation-plasma system are caused by the incoherent electron-photon scattering. Using the Boltzmann equation with a Langevin-like term describing the stochastic force, we investigate the influence of this incoherent scattering on the evolution of acoustic oscillations in the radiation-plasma system. The stochastic fluctuation per collision time on average is small. Nevertheless, it cumulatively leads to a significant Brownian drifting of the phase of the acoustic oscillations. The coherence of the oscillations cannot be maintained during their evolution by the recombination. As a consequence, the linear-theory-predicted fine structures in the angular power spectrum of the anisotropies of cosmic microwave radiation, such as the Doppler peaks, are most likely erased by the stochastic fluctuations.
收录类别SCI
语种英语
WOS记录号WOS:A1996VU63800003
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8105
专题星系宇宙学研究部
作者单位BEIJING ASTRON OBSERV,BEIJING 100080,PEOPLES R CHINA
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GB/T 7714
Fang, LZ,Huang, Z,Wu, XP. Stochastic fluctuations in the primeval plasma of the universe[J]. INTERNATIONAL JOURNAL OF MODERN PHYSICS D,1996,5(5):495-506.
APA Fang, LZ,Huang, Z,&Wu, XP.(1996).Stochastic fluctuations in the primeval plasma of the universe.INTERNATIONAL JOURNAL OF MODERN PHYSICS D,5(5),495-506.
MLA Fang, LZ,et al."Stochastic fluctuations in the primeval plasma of the universe".INTERNATIONAL JOURNAL OF MODERN PHYSICS D 5.5(1996):495-506.
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