Four-dimensional supergravities from five-dimensional brane worlds

Abstract

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 Z 2 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 Z 2-odd bulk fields. Broken supersymmetry leads to stabilization of the interbrane distance.