2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/190688Recently, we proposed a new braneworld model [GIT] in which the collision of a brane universe and a vacuum bubble coming from the extra-dimension is utilized as a trigger of brane big-bang. In this article, mainly reviewing this model, we briefly summarize cosmological braneworld scenarios in which collision of branes plays an important role.8 pages in Latex with the PTP style. 2 figures. To be published in Proceedings of the YITP workshop YITP-W-01-15 ``Braneworld - Dynamics of spacetime with boundary", brief comments on brane inflation and references addedHigh Energy Physics - TheoryGeneral Relativity and Quantum Cosmologytext