New D=4 gauged supergravities from N=4 orientifolds with fluxes

TL;DR

This paper explores how different flux configurations in type IIB orientifolds lead to new four-dimensional gauged N=4 supergravity models with distinct duality symmetries.

Contribution

It introduces novel gaugings of N=4 supergravity derived from fluxes in orientifold compactifications, expanding the landscape of consistent supergravity theories.

Findings

New classes of D=4 gauged supergravities from fluxes

Different duality symmetry embeddings in N=4 models

Construction of gaugings with nilpotent algebra from fluxes

Abstract

We consider classes of T_6 orientifolds, where the orientifold projection contains an inversion I_{9-p} on 9-p coordinates, transverse to a Dp-brane. In absence of fluxes, the massless sector of these models corresponds to diverse forms of N=4 supergravity, with six bulk vector multiplets coupled to N=4 Yang--Mills theory on the branes. They all differ in the choice of the duality symmetry corresponding to different embeddings of SU(1,1)\times SO(6,6+n) in Sp(24+2n,R), the latter being the full group of duality rotations. Hence, these Lagrangians are not related by local field redefinitions. When fluxes are turned on one can construct new gaugings of N=4 supergravity, where the twelve bulk vectors gauge some nilpotent algebra which, in turn, depends on the choice of fluxes.