# Higher Forms and Membranes in 4D Supergravities

## TL;DR

This paper reviews how gauge three-form fields in 4D supergravity can dynamically generate coupling constants, connect to string compactifications with fluxes, and support membrane-induced domain wall solutions that change the cosmological constant.

## Contribution

It introduces a framework for incorporating three-form multiplets in 4D supergravity models derived from string theory, exploring their role in vacuum structure and domain walls.

## Key findings

- Coupling constants can be dynamically generated by gauge three-forms.
- Membranes can interpolate between vacua with different cosmological constants.
- The setup naturally arises from type-II string compactifications with fluxes.

## Abstract

We review the dynamical generation of coupling constants in 4D supergravity by means of gauge three-form fields. The latter are introduced as components of particular chiral supermultiplets and can be coupled to membranes preserving local supersymmetry. Such a set-up naturally arises from type-II string compactifications on Calabi-Yau manifolds with fluxes. We present generic 4D $\mathcal N=1$ supergravity models with three-form multiplets and study domain wall solutions supported by membranes, which interpolate between vacua with different values of the cosmological constant.