# Melanopogenesis: Dark Matter of (almost) any Mass and Baryonic Matter from the Evaporation of Primordial Black Holes weighing a Ton (or less)

## TL;DR

This paper explores how primordial black hole evaporation can produce a wide range of dark matter particles and baryon asymmetry, offering a unified early-universe scenario with testable predictions.

## Contribution

It provides a comprehensive calculation of dark matter and baryon production from black hole evaporation across various masses and mechanisms, including simultaneous generation.

## Key findings

- Dark matter can originate from black holes of various masses with correct relic density.
- Black hole evaporation can produce baryon asymmetry via multiple mechanisms.
- The scenario suggests potential observational tests for early universe physics.

## Abstract

The evaporation of primordial black holes with a mass in the $1\ {\rm gram}\lesssim M_{\rm PBH}\lesssim$1000 kg range can lead to the production of dark matter particles of almost any mass in the range $0.1\ {\rm MeV}\lesssim m_{\rm DM}\lesssim 10^{18}$ GeV with the right relic density at very early times, $\tau\lesssim 10^{-10}$ s. We calculate, as a function of the primordial black holes mass and initial abundance, the combination of dark matter particle masses and number of effective dark degrees of freedom leading to the right abundance of dark matter today, whether or not evaporation stops around the Planck scale. In addition, since black hole evaporation can also lead to the production of a baryon asymmetry, we calculate where dark matter production and baryogenesis can concurrently happen, under a variety of assumptions: baryogenesis via grand unification boson decay, via leptogenesis, or via asymmetric co-genesis of dark matter and ordinary matter. Finally, we comment on possible ways to test this scenario.