Diffuse emission from black hole remnants

Understand

We point out that conservation of information implies that remnants produced at the end of black hole evaporation should radiate in the low-frequency spectrum.

• We model this emission and derive properties of the diffuse radiation emitted by an otherwise dark population of such objects.
• We show that for early universe black holes the frequency and energy density of this radiation, which are in principle measurable, suffice to estimate the remnant density.