Creation of Quark-gluon Plasma in Celestial Laboratories

It is shown that a gravitationally collapsing black hole acts as an ultrahigh energy particle accelerator that can accelerate particles to energies inconceivable in any terrestrial particle accelerator, and that when the energy E of the particles comprising the matter in the black hole is $\sim {10}^2$ GeV or more,or equivalently the temperature T is $\sim {10}^{15}$ K or more, the entire matter in the black hole will be in the form of quark-gluon plasma permeated by leptons.