Using precise data recently gathered at three different laboratories and some new theoretical tools, Gerald A. Miller, a UW physics professor, has found that the neutron has a negative charge both in its inner core and its outer edge, with a positive charge sandwiched in between to make the particle electrically neutral.
Eefimov state of three massive bodies of different mass, predicted in 1970. We can consider it a quantum gravity effect at low scale - compare the AWT's knot model of neutron and proton. The same structure, just inverse one is relevant for proton, where uncompensated isospin charge of up quarks manifests itself by electrostatic charge at distance.
Efimov states exists on every dimensional scale, for example inside of hadrons and boson condensates or superconductors. Note, that Efimov trimer state becomes flat, when all particles involved are of the same mass - so its responsible for fractional Hall charge (quantum Hall effect) in thin layers of graphene or Hahn purpur BaCuSi2O6, where path of electrons is geometrically degenerated (frustrated) into flat structure by external magnetic field. Analogously, higher - just less stable/probable - Efimov state exist in four-body systems of boson condensates.
Efimov trimers are analogy of chaotic double pendulum, the rods of which are mediated by gravity force (N-body problem). It just illustrates the limits of formal math to describe even conceptually quite simple systems, which belongs into realm of Aether theory and must be solved by particle simulations in iterative/recursive way.