2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/201361The thermal and quark/baryon chemical potential dependences of quark condensate and masses of $π$- and $σ$-mesons are studied in the instanton model of the QCD vacuum in precritical region. The impact of phonon-like excitations of instanton liquid on the characteristics of $σ$-meson in such an environment is also examined.9 pages, 3 figuresHigh Energy Physics - Phenomenologytext