Head-on-collision of modulated dust acoustic waves in strongly coupled dusty plasma

The derivative expansion perturbation method is applied to a strongly coupled dusty plasma 
system consisting of negatively chargeddustgrains, electrons, and ions. The basic equations 
are reduced to a nonlinear Schrödinger type equation appropriate for describing the 
modulated dust acoustic (DA) waves. We have examined the modulation (in) stability and 
the dependence of the system physical parameters (angular frequency and group velocity) 
on the polarization force variation. Finally, the extended Poincaré-Lighthill-Kuo technique