On compressional modes in radiative plasmas

Astronomy and Astrophysics – Astronomy

Scientific paper

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Big Bang Cosmology, Compression Waves, Plasma Compression, Plasma Radiation, Plasma Waves, Relativistic Plasmas, Cosmic Plasma, Galactic Evolution, Hydrodynamic Equations, Thermodynamics, Wave Dispersion

Scientific paper

Dispersion relations associated with compressional modes in radiative fluids are derived from Israel's relativistic theory of transient thermodynamics. The main focus is on regimes where the photons dominate the thermal energy and pressure of the two-component fluid. A comparison with standard results, derived earlier by Weinberg from conventional theory, shows that transient thermodynamics modifies not only the short-wavelength but also parts of the long-wavelength regime. The question of the survival of protogalaxies during the acoustic phase in an expanding universe is touched upon.

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