LIGO/Virgo Black Holes from a First Order Quark Confinement Phase Transition

Abstract

We propose that O(10 M) black holes observed by LIGO/Virgo originate from a first order phase transition at a temperature T∗100 MeV, associated with QCD′ - an early Universe deformation of the standard model QCD. This is realized by keeping the quark masses small compared to confinement scale down to T∼T∗, making QCD′ transition first order. We implement this scenario using a light scalar that could potentially be a good dark matter candidate.