How could wormhole could be constructed ?
By confining exotic matter to narrow regions to form the edges of three-dimensional space like a cube. The faces of the cube would resemble mirrors, except that the image is of the view from the other end of the wormhole. Although there is only one cube of material, it appears at two locations to the external observer. The cube links two ‘ends’ of a wormhole together. A traveler, avoiding the edges and crossing through a face of one of the cubes, experiences no stresses and emerges from the corresponding face of the other cube. The cube has no interior but merely facilitates passage from ‘one’ cube to the ‘other’.
The exotic nature of the edge material requires negative energy density and tension/pressure. But the laws of physics do not forbid such materials. The energy density of the vacuum may be negative, as is the Casimir field between two narrow conductors. Negative pressure fields, according to standard astrophysics, drove the expansion of the universe during its ‘inflationary’ phase. Cosmic string (another astrophysical speculation) has negative tension. The mass of negative energy the wormhole needs is just the amount to form a black hole if it were positive, normal energy. A traversable wormhole can be thought of as the negative energy counterpart to a black hole, and so justifies the appellation ‘white’ hole. The amount of negative energy required for a traversable wormhole scales with the linear dimensions of the wormhole mouth. A one meter cube entrance requires a negative mass of roughly 10^27 kg.
In a previous work by Maccon (Wormhole Induction Propulsion (WHIP) by Eric W. Davis and Maccone, C. (1995) “Interstellar Travel Through Magnetic Wormholes (7 pages)“, JBIS, Vol. 48, No. 11, pp. 453-458] ) , it was proposed that ultra-high magnetic field could generate a significant curvature in space-time fabric that could suffice a spacecraft to go through it. More specifically, Maccone claims that static homogeneous magnetic/electric fields with cylindrical symmetry can create spacetime curvature which manifests itself as a traversable wormhole.
It is speculated that future WHIP (wormhole induction propulsion) spacecraft could deploy ultrahigh magnetic fields along with exotic matter- energy fields (e.g. radial electric or magnetic fields, Casimir energy field, etc.) in space to create a wormhole and then apply conventional space propulsion to move through the throat to reach the other side in a matter of minutes or days, whence the spacecraft emerges several AU’s or light-years away from its starting point. The requirement for conventional propulsion in WHIP spacecraft would be strictly limited by the need for short travel through the wormhole throat as well as for orbital maneuvering near distant worlds. The integrated system comprising the magnetic induction/exotic field wormhole and conventional propulsion units could be called WHIPIT or “Wormhole Induction Propulsion Integrated Technology.”
Magnetic field strengths would need to be billions of Tesla so that a significant radius of curvature and slowing of c can be measured
Magnetic induction technologies based on nuclear explosives/implosives might work in order to achieve large magnitude results. An order of magnitude calculation indicates that magnetic fields generated by nuclear pulsed energy methods could be magnified to (brief) static values of about one billion Tesla by factoring the nuclear-to-chemical binding energy ratio.