Wrapping rules (in) string theory

Understand

In this paper we show that the number of all 1/2-BPS branes in string theory compactified on a torus can be derived by universal wrapping rules whose formulation we present.

• These rules even apply to branes in less than ten dimensions whose ten-dimensional origin is an exotic brane.
• In that case the wrapping rules contain an additional combinatorial factor that is related to the highest dimension in which the ten-dimensional exotic brane, after compactification, can be realized as a standard brane.
• We show that the wrapping rules also apply to cases with less supersymmetry.