# Can scalars have asymptotic symmetries?

## TL;DR

This paper investigates whether soft scalar particles can be associated with asymptotic symmetries, revealing that certain Yukawa-type theories possess infinite conserved charges, suggesting a potential new class of symmetries.

## Contribution

It demonstrates that soft scalars in Yukawa-type theories have an infinite number of conserved charges, proposing a possible extension of asymptotic symmetry concepts to scalars.

## Key findings

- Yukawa-type theories have infinite conserved charges for soft scalars.
- Soft scalars may be associated with asymptotic symmetries.
- The study extends the understanding of asymptotic symmetries beyond spins > 0.

## Abstract

Recently it has been understood that certain soft factorization theorems for scattering amplitudes can be written as Ward identities of new asymptotic symmetries. This relationship has been established for soft particles with spins $s > 0$, most notably for soft gravitons and photons. Here we study the remaining case of soft scalars. We show that a class of Yukawa-type theories, where a massless scalar couples to massive particles, have an infinite number of conserved charges. This raises the question as to whether one can associate asymptotic symmetries to scalars.