Аннотация:We study the formation of a quasi trapped surface in the collision of two charged wall-shock waves in (A)dS space-time. The advantage of this model is the essential simplicity of calculations. The quasi trapped surface has an infinite extent in transversal directions and also has a sharp bend in the location of the domain wall. We consider a regularization that deforms the quasi trapped surface to make it a smooth compact surface. Taking into account that the entropy density of the TS admits the remove of the regularization one can restrict ourself to quasi TS calculations. We study the TS equation, more precisely, the quasi TS equation, for a charged wall–wall collision and reduce it to an algebraic equation that we study numerically.