Head-on collision between two-counter-propagating electron acoustic soliton and double layer in an unmagnetized plasma

The head-on collision between two-counter-propagating electron acoustic solitons and double layers (DLs) in an unmagnetized collisionless multi-species plasma consisting of inertial cold fluid (α, q)-distributed hot electrons positrons has been analyzed with the stationary background massive positive ions. For nonlinear analysis colliding wave phenomena, coupled Korteweg–de Vries equation (KdVE), modified KdVE (mKdVE), standard Gardner have derived by adopting extended Poincaré–Lighthill–Kuo technique. effect non-dimensional parameters on collisional KdV, mKdV, (GSs) DLs examined detail considering limiting cases q)-distributions. It is found that model supports (i) compressive rarefactive KdV GSs, (ii) only mKdV solitons, (iii) DLs. are more affected nonextensivity increase temperature than their counterpart, whereas existed presence nonthermality.