The Topological G<sub>2</sub> String
The Topological G<sub>2</sub> String
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 terms of conformal …