Abstract
It is shown that in the radiation era of the Universe spatial temperature fluctuations (ΔT/T)<10−5 in the cosmic plasma lead to huge changes of the density up to (Δϱ/ϱ)≃104. This effect results from the fact that the cosmic plasma in the radiation era can be considered as a general relativistic Boltzmann gas which is found in the very vincinity of equilibrium.
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Lessner, G. Spatial density fluctuations in the radiation era of the Universe. Astrophys Space Sci 100, 359–367 (1984). https://doi.org/10.1007/BF00651611
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DOI: https://doi.org/10.1007/BF00651611