Wormholes threaded with magnetic flux were introduced by Einstein and others as models f particles. Each mouth of the wormhole looks like a charged particle. They necessarily have equal and opposite charges. So the early models had each wormhole as a particle antiparticle pair. My work requires not to be orientable within particle structures. (see my eminently readable paper of the orientability of space time). Wormholes which are not orientable, where time reverses or space gets reflected, can have total net charge. A single wormhole can then be a model for a charged particle. The time reversal required to model quantum theory, naturally creates electrically charged particles from the source free equations. t does this because the electric field changes direction when the time direction changes.
This paper was written with my dear friend and mathematician Tammo Diemer, consequently it is abstract and mathematical. Not easy reading.