Abstract
In this Letter we present a simple, general prescription for coupling brane localized fields to bulk supergravity. We illustrate the procedure by considering 6D N=2 bulk supergravity on a 2D orbifold, with brane fields localized at the fixed points. The resulting action enjoys the full 6D N=2 symmetries in the bulk, and those of 4D N=1 supergravity at the brane positions.
Highlights
Consider a bulk supergravity theory in higher dimensions (D > 4), in which the extra dimensions are compactified on an orbifold
The idea that fields may be localized on a brane has played an important role in many aspects of fundamental high energy physics and cosmology for more than a decade
We have shown how to construct bulk plus brane actions which incorporate the symmetries of 6D N=2 supergravity away from the branes and 4D N=1 supergravity at the brane positions
Summary
Consider a bulk supergravity theory in higher dimensions (D > 4), in which the extra dimensions are compactified on an orbifold. One might have believed that an offshell description of the bulk supergravity be necessary to construct general couplings to brane fields [29] This is because on-shell, the supersymmetry algebra closes only up to the equations of motion, and so care must be taken if we introduce new terms to the action. Our motivation is to provide a field theory setup in which we can study scenarios like Supersymmetric Large Extra Dimensions [12], or orbifold-GUTs [13], allowing for non-trivial dynamics for gravity, bulk and brane matter These constructions have provided interesting ways to approach long-standing problems in cosmology and particle physics, and find more fundamental descriptions within string theory. We take as the target quaternionic manifold of the hyperscalars the canonical example
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