Macroscopic traversable wormholes: minimum requirements

While wormholes are just as good a prediction of Einstein's theory as black holes, they are subject to severe restrictions from quantum field theory. To allow for the possibility of interstellar travel, a macroscopic wormhole would need to maintain sufficiently low radial tidal forces. It is proposed in this paper that the assumption of zero tidal forces, i.e., the limiting case, is sufficient for overcoming the restrictions from quantum field theory. The feasibility of this approach is subsequently discussed by (a) introducing the additional conditions needed to ensure that the radial tidal forces can indeed be sufficiently low and (b) by viewing traversable wormholes as emergent phenomena, thereby increasing the likelihood of their existence.