Were you born in an aborted primordial black hole?

TL;DR

This paper introduces a novel electroweak baryogenesis mechanism involving primordial black holes, linking baryon asymmetry and dark matter densities through gravitational collapse and local plasma reheating.

Contribution

It proposes a new baryogenesis process triggered by primordial black hole formation, supported by numerical relativity simulations, connecting dark matter and baryon densities.

Findings

Overdensity threshold for baryogenesis calculated via simulations

Aborted PBHs can produce observed baryon-to-photon ratio

Mechanism links dark matter contribution to baryon asymmetry

Abstract

We propose a mechanism of electroweak baryogenesis based on the Standard Model and explaining the coincidence between the baryon and Dark Matter (DM) densities. Large curvature fluctuations slightly below the threshold for Primordial Black Hole (PBH) formation locally reheat the plasma above the sphaleron barrier when they collapse gravitationally, leading to regions with a maximal baryogenesis at the Quantum Chromodynamics epoch. Using numerical relativity simulations, we calculate the overdensity threshold for baryogenesis. If PBH significantly contribute to the DM, aborted PBHs can generate a baryon density and an averaged baryon-to-photon ratio consistent with observations.