%0 Journal Article %T Geometric and topological structures related to M-branes II: Twisted String and String^c structures %A Hisham Sati %J Mathematics %D 2010 %I arXiv %X The actions, anomalies, and quantization conditions allow the M2-brane and the M5-brane to support, in a natural way, structures beyond Spin on their worldvolumes. The main examples are twisted String structures. This also extends to twisted String^c structures, which we introduce and relate to twisted String structures. The relation of the C-field to Chern-Simons theory suggests the use of the String cobordism category to describe the M2-brane. %U http://arxiv.org/abs/1007.5419v2