Charge and the topology of spacetime

A new class of electrically charged wormholes is described in which the out er 2-sphere is not spanned by a compact, co-orientable hypersurface, These wormholes can therefore display net electric charge from the source-free Ma xwell equations. This extends the work of Sorkin on non-space-orientable ma nifolds, to spacetimes which do not admit a time orientation. The work is m otivated by the suggestion that quantum theory can be explained by modellin g elementary particles as regions of spacetime with non-trivial causal stru cture. The simplest example of an electrically charged spacetime carries a spherical symmetry.