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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 recombination, which are usually on the same time scale, are included. The strong dust coupling is represented by a viscoelastic relaxation model with a wavevector dependent relaxation time. It is found that the dispersion properties of the dust acoustic waves can be considerably affected by the strong coupling and relaxation processes.