Current-driven dust ion-acoustic instability in a collisional dusty plasma with charge fluctuations

The extended fluid analysis of the excitation of dust ion-acoustic waves (DIAWs) in a collisional dusty plasma [Merlino, IEEE Trans. Plasma Sci. 25, 60 (1997)] is reconsidered to include self-consistently the fluctuations in the charges of the dust grains, which liberate or capture electrons and protons. The numerical results show that the dust charge fluctuations can have a significant influence on the excitation of the DIAW and may deeply modify its nonlinear features.