2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/193934The in-medium behavior of the nucleon spectral density including self-energies is revisited within the framework of QCD sum rules. Special emphasis is given to the density dependence of four-quark condensates. A complete catalog of four-quark condensates is presented and relations among them are derived. Generic differences of such four-quark condensates occurring in QCD sum rules for light baryons and light vector mesons are discussed.Version accepted for publication: corrected typos, minor changes based on referee comments included, reference addedHigh Energy Physics - PhenomenologyNuclear Theorytext