“…Nowadays, such an extreme state of matter may occur naturally in the core of compact stellar objects like neutron stars or during neutron star merger events. In a laboratory environment, extreme temperatures and densities can be created in relativistic collisions of heavy particles, see for example [1,2,3,4,5] for reviews. Such heavy-ion collisions are furthermore the only means by which bulk properties of a non-Abelian gauge theory, such as Quantum Chromodynamics (QCD), can be assessed experimentally.…”