A Double Sigma Model for Double Field Theory

TL;DR

This paper introduces a sigma model with a doubled target space that reproduces the equations of motion of double field theory, establishing a new connection between worldsheet models and target space physics.

Contribution

It constructs a sigma model with doubled target space and shows its background equations match double field theory's equations of motion, linking worldsheet and target space formulations.

Findings

The sigma model's background equations coincide with double field theory equations.

The model provides a new perspective on the effective field theory for string backgrounds.

Establishes a direct link between sigma models and double field theory.

Abstract

We define a sigma model with doubled target space and calculate its background field equations. These coincide with generalised metric equation of motion of double field theory, thus the double field theory is the effective field theory for the sigma model.