Remark: What the source theorem does not establish

The theorem is the free-scalar fixed-background result. It does not prove evaporation backreaction, a collapse solution, an interacting Standard Model spectrum, or a message-recovery law. For other species, the appropriately normalized source term has the form

with the field-specific scattering problem and multiplicities specified separately Page1976,ArbeyAuffinger2019. Equation (eq:speciesrate) is not a claim that those additional scattering calculations have been performed here.