7D (non-)susy vacua & DWs from dynamical open strings

TL;DR

This paper investigates how adding open string degrees of freedom to 7D supergravity compactifications affects vacuum solutions, revealing new AdS7 vacua and domain wall solutions that interpolate between them.

Contribution

It introduces a novel coupling of open string scalars and fluxes into 7D supergravity, leading to new vacuum solutions and domain wall configurations.

Findings

Discovery of new AdS7 vacua with and without supersymmetry.

Construction of analytical and numerical domain wall solutions.

Enhanced understanding of open string effects in warped compactifications.

Abstract

Warped compactifications of massive type IIA supergravity on a 3-sphere with spacetime-filling O6/D6 sources are known to admit a half-maximal gauged supergravity description in 7D. We study the effect of introducing open string degrees of freedom (scalars and fluxes) in such dimensional reductions, associated with the spacetime-filling sources. From the 7D supergravity point of view, this can be realized by coupling the gravity multiplet with extra vector multiplets and adding new components to the embedding tensor describing the gauging. The scalar potential of the underlying theory exhibits novel AdS7 vacuum solutions, with and without supersymmetry. Finally, we explore the net of domain wall solutions interpolating between the different pairs of vacua, and present analytical as well as numerical solutions.