Nonthermal Effects on the Landau Damping of Dust Acoustic Waves in a Lorentizan Plasma

Abstract

The dust acoustic waves propagating in a dusty Lorentzian plasma are found in the range of kvd << ω << kvi, kve where vα is the thermal velocity of species α(= i, e, d). The damping rate is shown to be dependent on the spectral index k as well as the ratio of ion density to that of electron. The maximum Landau damping rate is derived and found to be approximately where 1 < < 1.33 is a k-dependent factor which reduces to unity as the nonthermal e?ect disappears.