Braneworld Kaluza - Klein Reduction

We obtain new results for consistent braneworld Kaluza-Klein reductions, showing how we can derive four-dimensional N = 2 gauged supergravity " localised on the AdS 4 brane " as an exact embedding in five-dimensional N = 4 gauged supergravity. Similarly, we obtain five-dimensional N = 2 gauged supergravity localised on an AdS 5 brane as a consistent Kaluza-Klein reduction from six-dimensional N = 4 gauged supergravity. These embed-dings can be lifted to type IIB and massive type IIA supergravity respectively. The new AdS braneworld Kaluza-Klein reductions are generalisations of earlier results on braneworld reductions to ungauged supergravities. We also discuss analytic continuations to give a de Sitter gauged supergravity in four dimensions as a braneworld reduction from a five-dimensional de Sitter supergravity, which itself arises from a Kaluza-Klein reduction of type IIB * supergravity on the hyperbolic 5-sphere.