Primordial black holes from an electroweak phase transition

TL;DR

This paper introduces a novel mechanism for primordial black hole formation during a first-order electroweak phase transition, involving Fermi-balls collapsing into PBHs, with potential signals detectable via gravitational waves and collider experiments.

Contribution

It proposes a new PBH formation scenario linked to electroweak phase transition dynamics and Fermi-ball collapse, extending the Standard Model with a singlet scalar.

Findings

PBHs can form from Fermi-ball collapse during FOEWPT

The scenario allows for PBH dark matter candidates

Potential experimental signals include gravitational waves and collider signatures

Abstract

We propose a mechanism that forms primordial black holes (PBHs) via a first-order electroweak phase transition (FOEWPT). The FOEWPT is realized by extending the Standard Model with a real singlet scalar, while the PBH formation is achieved by the collapse of non-topological solitons called Fermi-balls. Such solitons form via trapping fermions in the false vacuum during the FOEWPT, and they eventually collapse into PBHs due to the internal Yukawa attractive force. We demonstrate that a scenario with PBH dark matter candidate can exist, and the typical experimental signals include FOEWPT gravitational waves and the multi-lepton/jet or displaced vertex final states at the LHC.