Soft-Theorems for Scalar Particles: The Dilatons Story

TL;DR

This paper reviews recent developments in soft theorems for dilatons, highlighting their similarities, differences, and connections to symmetries in conformal and string theories.

Contribution

It provides a comparative analysis of soft theorems for two types of dilatons, elucidating their theoretical significance and underlying symmetry structures.

Findings

Identifies key similarities and differences in soft theorems for the two dilaton types

Connects soft theorems to underlying symmetries of the theories

Summarizes recent advances in the understanding of dilaton soft theorems

Abstract

We summarize recent results regarding single and double soft theorems of two different particles named dilatons, the Nambu-Goldstone boson of the spontaneously broken conformal field theories and the massless scalar particle of the closed string theories. Similarities and differences between the soft theorems of these two particles are discussed as well as their connections with the symmetries of the theories.