We present a static, spherically symmetric, traversable wormhole solution to multimetric gravity which is sustained by only non-exotic matter, i.e., matter which satisfies all energy conditions. The possibility of this solution arises from the fact that under certain conditions the multimetric gravitational field equations reduce to the Einstein equations, but with a negative effective gravitational constant. We show that the ADM mass of this wormhole vanishes, so that it appears massless to observers in the asymptotically flat spacetime. We finally speculate on the feasibility of creating and maintaining this type of wormhole by an advanced civilization.
This is paper is an intellectual exercise. The authors point out the near impossibility of any civilization they can conceive of, or even a combination of civilizations, actually constructing such a stable, non-exotic matter based traversable wormhole. But that doesn't mean that someone else hasn't figured out how to do it, either without exotic matter, or with it. To download the .PDF of the paper, click here.