N=2 central charge superspace and a minimal supergravity multiplet

TL;DR

This paper extends central charge superspace to local supersymmetry, identifying gauged transformations as diffeomorphisms, and describes a specific minimal supergravity multiplet with 24+24 components using radical constraints.

Contribution

It introduces a novel extension of central charge superspace to local supersymmetry and characterizes a minimal supergravity multiplet with radical constraints.

Findings

Gauged central charge transformations are equivalent to diffeomorphisms.

A specific vector-tensor supergravity multiplet with 24+24 components is described.

The framework unifies transformations under a common geometric interpretation.

Abstract

We extend the notion of central charge superspace to the case of local supersymmetry. Gauged central charge transformations are identified as diffeomorphisms at the same footing as space-time diffeomorphisms and local supersymmetry transformations. Given the general structure we then proceed to the description of a particular vector-tensor supergravity multiplet of 24+24 components, identified by means of rather radical constraints.