Silk cushioning

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The diffusion damping (engl. Silk damping , by Joseph Silk , the effect of the first described in 1968) is an effect that the matter condensation with small fluctuations of the density of radiation during the Big Bang dampened. Since the intrinsic gravitation was insufficient, the silk damping prevented the formation of smaller accumulations of matter, while large accumulations of matter can collapse due to the high intrinsic gravity.

This is because during the recombination photons of places high matter density to places lower density diffuse while baryons transport. Photons reach a large free path and thus ultimately mass is transported out of the material accumulation. The silk attenuation led to a homogenization of the cosmic background radiation .

The presence of the silk attenuation motivates (among other things) the assumption of non-baryonic dark matter : if there were no dark matter, the cosmic background radiation should not have any fluctuations on small scales. Fluctuations in the measured temperature correspond to a density fluctuation in the baryon-photon gas of the universe ( equation of state ), which cannot exist due to the silk attenuation.

In fact, however, fluctuations in the background radiation are detected that cannot originate from the clump of baryonic matter. Instead, it is assumed that dark matter, which does not interact with radiation , caused the density or temperature fluctuations.

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