2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/192125The contribution of nucleons to the quark condensate in nuclear matter includes a piece of first order in $m_π$, arising from the contribution of low-momentum virtual pions to the $πN$ sigma commutator. Chiral symmetry requires that no term of this order appears in the $NN$ interaction. The mass of a nucleon in matter thus cannot depend in any simple way on the quark condensate alone. More generally, pieces of the quark condensate that arise from low-momentum pions should not be associated with partial restoration of chiral symmetry.9 pages (RevTeX). Definition of effective mass changed; numerical value of leading nonanalytic term corrected, along with various misprintsHigh Energy Physics - PhenomenologyNuclear Theorytext