TY - JOUR
T1 - Cosmological baryon sound waves coupled with the primeval radiation
AU - Yamamoto, Kazuhiro
AU - Sugiyama, Naoshi
AU - Sato, Humitaka
PY - 1997
Y1 - 1997
N2 - 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).
AB - 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).
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U2 - 10.1103/PhysRevD.56.7566
DO - 10.1103/PhysRevD.56.7566
M3 - Article
AN - SCOPUS:0007216339
SN - 1550-7998
VL - 56
SP - 7566
EP - 7577
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 12
ER -