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Cosmological transitions in which the Universe cools down from a deconfined phase to a confined one, are very exciting early universe phenomena. Typically such phase transitions (PT) occur in strongly coupled theories, making their theoretical analysis technically challenging. In this talk, I will focus on a class of approximately conformal theories where we obtain significant insights into the dynamics of the PT. By considering a 5D Randall-Sundrum framework, AdS/CFT dual to the 4D theory, we give a novel description of how bubbles of the confined phase might have nucleated in the deconfined phase. This lets us calculate the rate of the PT. We also discuss the associated gravitational wave signatures. |