2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35077We study the Friedmann-Robertson-Walker cosmological model to investigate non-smooth curvatures associated with multiple discontinuities involved in the evolution of the universe, by exploiting Lorentzian warped product scheme. Introducing double discontinuities occurred at the radiation-matter and matter-lambda phase transitions, we also discuss non-smooth features of the spatially flat Friedmann-Robertson-Walker universe.4 pagesGeneral Relativity and Quantum Cosmologytext