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Instability of dusty plasma waves in the presence of elongated and rotating charged particulates

A new dispersion relation for low-frequency waves in an unmagnetized dusty plasma is obtained when the plasma contains electrons, ions and non-spherical (elongated) rotating charged dust grains. Since the dipole moments of the latter are non-zero, significant modifications of the dusty plasma wave spectra emerge. Analyses of the newly found dispersion relation reveals instabilities of both the electromagnetic and electrostatic waves. Specifically, waves with frequencies close to the angular rotation frequency of the dust grains are found to be unstable. The relevance of our investigation to enhanced fluctuations in space and laboratory dusty plasmas has been pointed out.