Abstract
The backward periodic dust-acoustic waves (DAWs) in a dusty plasma in which dust particles move unidirectionally are considered. In the framework of the linear theory, the dispersion relation is derived and it is shown that backward DAWs are possible in the plasma. The developed nonlinear theory of backward DAWs is based on the derivation and analysis of the Sagdeev pseudopotential. Non-linear profiles of backward DAWs were calculated. It was found that backward DAW profiles are indistinguishable from the profile of a conventional forward DAW. Backward DAWs can be distinguished in the wave crest movement direction.
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