Topological <i>G</i><sub>2</sub> strings
Topological <i>G</i><sub>2</sub> strings
We construct new topological theories related to sigma models whose target space is a seven dimensional manifold of G_2 holonomy. We define a new type of topological twist and identify the BRST operator and the physical states. Unlike the more familiar six dimensional case, our topological model is defined in …