Hot Dust Acoustic Solitary Waves in Dust Plasma with Variable Dust Charge

Considering the variation of dust charges,We have analytically studied the governing equation for the system with the same model as that for cold dust acoustic waves in a demagnetized plasma but the contribution of hot dust.The result indicates that the governing equation is also a Korteweg-de Vries equaiton,although its amplitude and width will be smaller compared with the cold dust case.