NAOC Open IR  > 星系宇宙学研究部
Stochastic fluctuations in the primeval plasma of the universe
Fang, LZ; Huang, Z; Wu, XP
1996-10-01
Source PublicationINTERNATIONAL JOURNAL OF MODERN PHYSICS D
Volume5Issue:5Pages:495-506
AbstractBefore 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.
Indexed BySCI
Language英语
WOS IDWOS:A1996VU63800003
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8105
Collection星系宇宙学研究部
AffiliationBEIJING ASTRON OBSERV,BEIJING 100080,PEOPLES R CHINA
Recommended Citation
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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