Dust-acoustic solitary waves of the modified KdV equation in a warm dusty plasma with cold and hot nonthermal ions

A theoretical investigation has been made for the propagation of small, but finite, nonlinear dustacoustic waves (DAW) in a collisionless, unmagnetized dust plasma that contains hot negativelycharged dust particles, cold nonthermal ions, hot nonthermal ions and Maxwellian-distributed electrons. The reductive perturbation method is employed to reduce the basic set of fluid equations to the modified Korteweg-de Vried (KdV) equation. How the amplitudes and the widths of the dust-acoustic waves vary with the plasma parameters is studied by using numerical simulations. Results show that not only the fast ion but also the number densities and the temperatures of the dust, the cold ions, the hot ions and the electrons all can play significant roles in determining the features of the amplitude and the width.