# Halving ISO(7) supergravity

## TL;DR

This paper explores a specific half-maximal sector of $\mathcal{N}=8$ supergravity with ISO(7) gauging, revealing new vacua and a novel $\mathcal{N}=4$ gauging, enriching the understanding of supergravity models.

## Contribution

It introduces a new explicit $\mathcal{N}=4$ gauging within supergravity and analyzes its vacuum structure, including five new non-supersymmetric AdS vacua.

## Key findings

- Found five new non-supersymmetric AdS vacua.
- Contained known $\mathcal{N}=2$ and $\mathcal{N}=3$ vacua with full supersymmetry.
- Provided a new $\mathcal{N}=4$ gauging and its embedding in supergravity.

## Abstract

Half-maximal, $\,\mathcal{N}=4\,$, sectors of $\,D=4\,$ $\,\mathcal{N}=8\,$ supergravity with a dyonic ISO(7) gauging are investigated. We focus on a half-maximal sector including three vector multiplets, that arises as a certain $\,\textrm{SO}(3)_{\textrm{R}}$-invariant sector of the full theory. We discuss the embedding of this sector into the largest half-maximal sector of the $\,\mathcal{N}=8\,$ supergravity retaining six vector multiplets. We also provide its canonical $\,\mathcal{N}=4\,$ formulation and show that, from this perspective, our model leads in its own right to a new explicit gauging of $\,\mathcal{N}=4\,$ supergravity. Finally, expressions for the restricted duality hierarchy are given and the vacuum structure is investigated. Five new non-supersymmetric AdS vacua are found numerically. The previously known $\,\mathcal{N}=2\,$ and $\,\mathcal{N}=3\,$ AdS vacua are also contained in our $\,\mathcal{N}=4\,$ model. Unlike when embedded in previously considered sectors with fewer fields, these vacua exhibit their full $\,\mathcal{N}=2\,$ and $\,\mathcal{N}=3\,$ supersymmetry within our $\,\mathcal{N}=4\,$ model.