Brane orbits

TL;DR

This paper completes the classification of half-supersymmetric branes in toroidally compactified IIA/IIB string theory using T-duality representations, revealing new brane configurations and their charge orbits.

Contribution

It provides a comprehensive classification of branes in lower dimensions and introduces a last wrapping rule for space-filling branes, expanding understanding of brane configurations.

Findings

Derived a last wrapping rule for space-filling branes.

Identified T-duality representations of branes not arising from 10D reductions.

Analyzed charge constraints and duality orbits for half-supersymmetric branes.

Abstract

We complete the classification of half-supersymmetric branes in toroidally compactified IIA/IIB string theory in terms of representations of the T-duality group. As a by-product we derive a last wrapping rule for the space-filling branes. We find examples of T-duality representations of branes in lower dimensions, suggested by supergravity, of which none of the component branes follow from the reduction of any brane in ten-dimensional IIA/IIB string theory. We discuss the constraints on the charges of half-supersymmetric branes, determining the corresponding T-duality and U-duality orbits.