Properties of lightest mesons at finite temperature and quark/baryon chemical potential in instanton model of QCD vacuum

摘要

The thermal and quark/baryon chemical potential dependences of quark condensate and masses of $\pi$- and $\sigma$-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 $\sigma$-meson in such an environment is also examined.