WHAT DOES A CHANGE IN THE QUARK CONDENSATE SAY ABOUT RESTORATION OF CHIRAL-SYMMETRY IN MATTER

The contribution of nucleons to the quark condensate in nuclear matter includes a piece of first order in m(pi), arising from the contributi on of low-momentum virtual pions to the pi N sigma commutator. Chiral symmetry requires that no term of this order appears in the NN interac tion. The mass of a nucleon in matter thus cannot depend in any simple way on the quark condensate alone. More generally, pieces of the quar k condensate that arise from low-momentum pions should not be associat ed with partial restoration of chiral symmetry.