Asymptotic symmetries at null-infinity for the Rarita-Schwinger field with magnetic term

TL;DR

This paper investigates magnetic charges associated with the Rarita-Schwinger field in asymptotically flat spacetime, revealing an infinite-dimensional algebra of charges at null-infinity, advancing the understanding of dual BMS charges in supergravity.

Contribution

It introduces magnetic charges for the Rarita-Schwinger field via a boundary term, extending the study of asymptotic symmetries to supergravity contexts.

Findings

Discovery of an infinite-dimensional algebra of charges at null-infinity.

Identification of magnetic charges arising from boundary terms.

Extension of dual BMS charge analysis to supergravity.

Abstract

In this paper we study the magnetic charges of the free massless Rarita-Schwinger field in four dimensional asymptotically flat space-time. This is the first step towards extending the study of the dual BMS charges to supergravity. The magnetic charges appear due to the addition of a boundary term in the action. This term is similar to the theta term in Yang-Mills theory. At null-infinity an infinite dimensional algebra is discovered, both for the electric and magnetic charge.