Branes and Wrapping Rules

Abstract. We show that the branes of ten-dimensional IIA/IIB string theory must satisfy, upon toroidal compactification, specific wrapping rules in order to reproduce the number of supersymmetric branes that follows from a supergravity analysis. The realization of these wrapping rules suggests that IIA/IIB string theory contains a whole class of so-called non-standard Kaluza-Klein monopoles. Whereas branes couple to p-form potentials these non-standard Kaluza-Klein monopoles can be associated with mixed-symmetry potentials. We discuss a possible E11-symmetry underlying these new structures. 1