Dressed ion-acoustic soliton in a plasma with electrons featuring Tsallis distribution

Ion-acoustic dressed solitons are addressed in a three component electron-positron-ion plasma with nonextensive electrons. The approach based on the expansion of the Sagdeev potential up to the fourth-order is used. This approach yields the same dressed ion-acoustic soliton solution given by the renormalization procedure in the reductive perturbation method. The dressed soliton is then split into two contributions, the core and cloud structures, and compared to the Korteweg-de Vries (K-dV) ion-acoustic soliton solution. Our results reveal that the main quantities of these localized structures are significantly modified by the nonextensive effects. In particular, the departure between the dressed and K-dV solitons becomes much marked as the nonextensive parameter q (q < 1) increases. (C) 2015 Elsevier B.V. All rights reserved.