Cosmological baryon sound waves coupled with the primeval radiation

Kazuhiro Yamamoto, Naoshi Sugiyama, Humitaka Sato

研究成果: ジャーナルへの寄稿学術誌査読

14 被引用数 (Scopus)

抄録

The fluid equations for the baryon-electron system in an expanding universe are derived from the Boltzmann equation. The effect of the Compton interaction is taken into account properly in order to evaluate the photon-electron collisional term. As an application, the acoustic motions of the baryon-electron system after recombination are investigated. The effective adiabatic index [Formula presented] is computed for sound waves of various wavelengths, assuming the perturbation amplitude is small. The oscillations are found to be dumped when [Formula presented] changes from between 1 (for an isothermal process) to 5/3 (for an adiabatic process).

本文言語英語
ページ(範囲)7566-7577
ページ数12
ジャーナルPhysical Review D - Particles, Fields, Gravitation and Cosmology
56
12
DOI
出版ステータス出版済み - 1997
外部発表はい

All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学
  • 物理学および天文学(その他)

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