Bosonic sectorized strings and the $(DF)^{2}$ theory

TL;DR

This paper explores the bosonic sectorized string theory, deriving its spectrum, interactions, and connections to the $(DF)^2$ theory, revealing natural origins for certain features within the worldsheet framework.

Contribution

It provides a detailed analysis of the bosonic sectorized string, including its spectrum, amplitudes, and a link to the $(DF)^2$ theory, with a natural explanation for previously contrived aspects.

Findings

The bosonic ambitwistor string is recovered in the tensionless limit.

The effective action matches the mass-deformed $(DF)^2$ theory.

Inclusion of scalar fields arises naturally from the worldsheet formulation.

Abstract

In this work, we investigate the bosonic chiral string in the sectorized interpretation, computing its spectrum, kinetic action and $3$-point amplitudes. As expected, the bosonic ambitwistor string is recovered in the tensionless limit. We also consider an extension of the bosonic model with current algebras. In that case, we compute the effective action and show that it is essentially the same as the action of the mass-deformed $(DF)^{2}$ theory found by Johansson and Nohle. Aspects which might seem somewhat contrived in the original construction --- such as the inclusion of a scalar transforming in some real representation of the gauge group --- are shown to follow very naturally from the worldsheet formulation of the theory.