Diffuse emission from black hole remnants

TL;DR

This paper suggests that black hole remnants should emit low-frequency radiation, and models this emission to estimate their density in the universe based on observable diffuse radiation.

Contribution

It introduces a model for the low-frequency emission from black hole remnants and links this to their density in the universe, providing a potential observational signature.

Findings

Remnants emit low-frequency radiation detectable as diffuse background.

The radiation properties allow estimation of remnant density in the universe.

The model connects black hole remnants to observable cosmological signals.

Abstract

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.