Four-dimensional supergravities from five-dimensional brane worlds Original Research Article

We give the explicit form of the four-dimensional effective supergravity action, which describes low-energy physics of the Randall–Sundrum model with moduli fields in the bulk and charged chiral matter living on the branes. The relation between 5d and 4d physics is explicit: the low-energy action is derived from the compactification of a locally supersymmetric model in five dimensions. The presence of odd Z2 parity scalars in the bulk gives rise to effective potential for the radion in four dimensions. We describe the mechanism of supersymmetry breaking mediation, which relies on non-trivial configuration of these Z2-odd bulk fields. Broken supersymmetry leads to stabilization of the interbrane distance.