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An explicit realistic model featuring a supercool phase transition, whichallows us to explain the background of gravitational waves recently detected bypulsar timing arrays, is constructed. In this model the phase transitioncorresponds to radiative symmetry breaking (and mass generation) in a darksector featuring a dark photon associated with the broken symmetry. Thecompletion of the transition is ensured by a non-minimal coupling betweengravity and the order parameter and fast reheating occurs thanks to apreheating phase. Finally, it is also shown that the model leads to primordialblack hole production.

Pulsar Timing Arrays and Primordial Black Holes from a Supercool Phase Transition