Phononlike excitations of the instanton liquid

The phononlike excitations of (anti-)instanton $(\ifmmode \bar{I}\else \={I}\fi{}I)$ liquid due to adiabatic variations of wave functions are studied in this paper. The kinetic energy term is found and the proper effective Lagrangian for such excitations is evaluated. The properties of their spectrum, while the corresponding masses are defined by ${\ensuremath{\Lambda}}_{\mathrm{QCD}},$ are investigated based on the phenomenology of the QCD vacuum already developed.