= Entropy production by decay of a dominant relic
{title2=$s_+/s_-=(1+\rho_\phi/\rho_r)^{3/4}$}
At fixed <scale factor> and unchanged relativistic counts, instantaneous conversion of a relic into thermal radiation gives the displayed entropy-density enhancement. It exceeds one because the gas receives energy from outside its prior equilibrium sector. This does not contradict <cosmological entropy conservation>, whose source-free reversible assumptions fail during decay and thermalization.
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