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We consider a scenario where our universe is taken as a three-dimensionaldomain wall embedded in a five-dimensional Minkowski space-time, as originallyproposed by Brito and collaborators [1]. We explore the existence of a richerclass of soliton solutions and their consequences for the acceleration of theuniverse driven by collisions of bulk particle excitations with the walls. Inparticular it is shown that some of these solutions should play a fundamentalrole throughout the expansion process.

Degenerate and critical domain walls and accelerating universes driven by bulk particles