Asymptotic charges from soft scalars in even dimensions

TL;DR

This paper investigates asymptotic charges linked to soft scalar theorems in even-dimensional spacetimes, extending previous four-dimensional results, but the symmetry interpretation of these charges remains unclear.

Contribution

It extends the analysis of asymptotic charges from four to higher even dimensions for scalar fields, providing explicit spacetime expressions and highlighting unresolved symmetry aspects.

Findings

Derived simple expressions for asymptotic charges in even dimensions.

Extended the four-dimensional scalar soft theorem analysis to higher dimensions.

Identified the lack of a clear symmetry interpretation for these charges.

Abstract

We study asymptotic charges associated to a spin-zero analogue of Weinberg's soft photon and graviton theorems in even dimensions. Simple spacetime expressions for the charges are given, but unlike gravity or electrodynamics, the symmetry interpretation for the charges remains elusive. This work is a higher dimensional extension of the four dimensional case studied in arXiv:1703.07885 .