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This Defense Intelligence Reference Document (DIA-08-1004-004), dated 6 April 2010, was produced by the Defense Intelligence Agency under its Advanced Aerospace Weapon System Applications (AAWSA) Program. It is one of a series of advanced technology reports from FY 2009. It reviews the general relativity physics of traversable wormholes and flat-faced "stargate" solutions for faster-than-light travel. It also covers the exotic negative energy these would need, proposed lab methods for generating it such as the Casimir effect and squeezed vacuum, and the constraints involved.
“G. A.”17 pages
UNCLASSIFIED//F811. 8FFll!l*le lal!II!! 8111!¥ (3b) (3c) These are the Einstein field equations for a traversable wormhole that is produced by a thin shell of localized matter. Equations (3a-c) imply that (for CQ a convex hypersurface) one is dealing with negative surface energy density and negative surface tensions. This is exotic matter! The negative surface tension ( = positive outward pressure, a.k.a. gravitational repulsion) is required to keep the throat open and stable against collapse. To make this thin shell wormhole entirely flat requires that one chooses the throat en to have at least one flat face (picture the thin shell in Figure 5 becoming flat). On that face the two principal radii of curvature become p1 = p2 = er; as required by standard three-dimensional geometry; therefore, substituting this requirement into Equations (3a-c) gives: which is a remarkable result. This means that a traveler encountering and going through such a wormhole- stargate will feel no tidal gravitational forces and see no exotic matter threading the throat. A traveler stepping through the throat will simply be shunted into another remote spacetime region or into another universe (note: the Einstein field equation does not fix the spacetime topology, so it is possible that wormholes are inter-universe as well as intra-universe tunnels). Therefore, one can construct a stargate by generating a thin shell or surface layer of exotic matter much like a thin film of soap stretched across a loop of wire. C. WHAT A WORMHOLE LOOKS LIKE IN THE REAL WORLD The exotic matter threading a traversable wormhole throat produces repulsive gravity, which will then deflect light rays going through and around it. Figure 6. A Spherically Symmetric Traversable Wormhole Observed in Space The entrance to the spherically symmetric Morris & Thorne wormhole looks like a sphere that contains the mirror image of a whole other universe or remote region within our own universe, incredibly shrunken and distorted (see Figure 6). This is an 7 UNCLASSIFIED/ }F&A QFFI'sIAk n ■ &'li Ollk¥ ( 4)
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