Time-crystal ground state and production of gravitational waves from QCD phase transition

While the energy density of the quark-gluon mean-field is monotonously decaying in real time, its pressure undergoes a series of violent oscillations at the characteristic QCD time scales that generates a primordial multi-peaked gravitational waves signal in the radio frequencies’ domain. The signal as an echo of the QCD phase transition, and is accessible by the FAST and SKA telescopes.