General Target Space Duality and Its Effects on D-branes

TL;DR

This paper explores a generalized form of target space duality involving compactified directions and worldsheet parity, analyzing its impact on D-branes and revealing new types of branes through boundary state formalism.

Contribution

It introduces a broader class of duality transformations beyond T-duality and examines their effects on D-branes, including the emergence of new mixed brane configurations.

Findings

Transformations extend beyond traditional T-duality.

Resulting branes include known mixed branes and novel variants.

Boundary state analysis elucidates the properties of these branes.

Abstract

We study a special combination of the compact directions of the spacetime (compactified on tori) and the worldsheet parity transformed of these directions. The transformations that change the compact part of the spacetime to this combination, are more general than the T-duality transformations. Many properties of this combination and also of the corresponding worldsheet fermions are studied. By using the boundary state formalism, we study the effects of the above transformations to D-branes. For the special cases the resulted branes reduce to the known mixed branes, or reduce to the modified mixed branes.