T-duality as coordinates permutation in double space for weakly curved background

TL;DR

This paper extends the understanding of T-duality in string theory by showing it can be represented as coordinate permutation in double space, even in weakly curved backgrounds, maintaining the same duality group structure.

Contribution

It generalizes the coordinate permutation representation of T-duality to weakly curved backgrounds, demonstrating the invariance of the duality group and the unified description of T-dual theories.

Findings

T-duality acts as coordinate permutation in double space.

The duality group remains unchanged in weakly curved backgrounds.

Double space unifies all T-dual theories regardless of background curvature.

Abstract

In the paper [1] we showed that in double space, where all initial coordinates $x^\mu$ are doubled $x^\mu \to y_\mu$, the T-duality transformations can be performed by exchanging places of some coordinates $x^a$ and corresponding dual coordinates $y_a$. Here we generalize this result to the case of weakly curved background where in addition to the extended coordinate we will also transform extended argument of background fields with the same operator $\hat {\cal T}^a$. So, in the weakly curved background T-duality leads to the physically equivalent theory and complete set of T-duality transformations form the same group as in the flat background. Therefore, the double space represent all T-dual theories in unified manner.