Traversable wormholes without exotic matter in multimetric repulsive gravity

Understand

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 Arnowitt-Deser-Misner 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.