Dust acoustic waves in collisional plasmas with highly correlated dusts

The theory of dust-acoustic waves in plasmas with strongly coupled dusts is reviewed. Physical effects needed for a self-consistent description, such as dust-charge variation, collisional dissipation, ionization and recombina tion, which are usually on the same time scale, are included. The strong du st coupling is represented by a viscoelastic relaxation model with a waveve ctor dependent relaxation time. It is found that the dispersion properties of the dust acoustic waves can be considerably affected by the strong coupl ing and relaxation processes.