Dissipation of Primordial Turbulence and Thermal History of the Universe

概要

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The assumption that in the early stage of the universe there existed turbulence of photons and plasma dragged by them can explain the formation of galaxies plausibly. Using simple expressions to represent the decay law of the primordial turbulence, the thermal history of gas at the pre-galactic stage is followed and the residual ionization degree of hydrogen is computed. It is found that maximum temperatures attainable are about 10^4 °K for a wide range of heating paramaters. This is because a kind of thermostat that keeps gas temperature below 10^4 °K operates:the increase of temperature above 10^4 °K is prevented by the increase of the ionization degree and the resultant increase of coolingtate. Therefore, it can be concluded that galaxies cannot be formed through the thermal instability due to the heating by the primordial turbulence.
理論物理学刊行会の論文
1971-08-25