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The residual spectra of matter and radiation fluctuations in the early universe are investigated. We study the evolution of primordial adiabatic and isothermal fluctuations through the decoupling epoch. Amplification of adiabatic density fluctuations during decoupling, or velocity "overshoot", is largely suppressed by Compton drag. Consequently, the amplitude of density fluctuations entering the horizon prior to decoupling is larger than hitherto assumed in the adiabatic theory. Damping of primordial adiabatic density fluctuations by an order of magnitude occurs on mass-scales of 3 × 1013 M⊙ (Ω = 1) or 1014 M⊙ (Ω = 0.2).
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Silk et al. (1980) studied this question.
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