  The models of translationally invariant infinite nuclear matter in the
relativistic mean field models are very interesting and simple, since the
nucleon can connect only to a constant vector and scalar meson field. Can one
connect these to the complicated phase transitions of QCD ? For an affirmative
answer to this question, one must consider models where the coupling constants
to the scalar and vector fields must depend on density in a non-linear way,
since as such the models are not explicitly chirally invariant. Once this is
ensured, indeed one can derive a quark condensate indirectly from the energy
density of nuclear matter which goes to zero at large density and temperature.
The change to zero condensate indicates a smooth phase transition.
