Backreacted T-folds and non-geometric regions in configuration space

Understand

We provide the backreaction of the T-fold doubly T-dual to a background with NSNS three-form flux on a three-torus.

• We extend the backreacted T-fold to include cases with a flux localized in one out of three directions.
• We analyze the resulting monodromy domain walls and vortices.
• In these backgrounds, we give an analysis of the action of T-duality on observables like charges and Wilson surfaces.