Abstract
In this paper, we study dust acoustic solitary waves (DASW) based on the dust charge Zd =equilibrium density of ions / equilibrium density of dust ions , initial dust speed do Udo and initial streaming speed \nueo of electrons with the introduction of relativistic effect. Only rarefactive solitons are found to exist in the unmagnetized dusty plasma in presence of relativity for electrons. It is observed that for greater values of dust charge Zd rarefactive solitons exist.
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