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This is an unclassified Defense Intelligence Reference Document (DIA-08-1003-015), dated 29 March 2010. The Defense Intelligence Agency prepared it under the Advanced Aerospace Weapon System Applications (AAWSA) Program, and Rep. Burchett entered it into the House committee record. The paper uses a general relativity metric tensor approach to look at how engineering spacetime might enable propulsion, including warp drives, apparent superluminal travel, reduced effective mass and antigravity. It finds these ideas consistent with physics but far beyond present engineering capability.
UNCLASSIFIED/ MaRsiffeerletsdigatW From a viewpoint exterior to the region, however, from the above one finds that the remotely observed coordinate ratio measurement yields a different value „ =dr = 1 g oo di t'L — c (7) Therefore, although a local measurement with physical rods and clocks yields c, an observer in an exterior reference frame remote from the mass speaks of light "slowing down" on a radial approach to the mass owing to the ratio g/—g i , 1, the velocity of light—and exotic-technology craft velocities that obey similar formulas—would appear superluminal in the exterior frame. This gives our fifth entry for the table of physical effects. Refractive Index Modeling Given that velocity-of-light effects in a spacetime-altered region, as viewed from an external frame, are governed by Equation (7), it is seen that the effect of spacetime alteration on light propagation can be expressed in terms of an optical refractive index n, defined by C v - 11= goo where n is an effective refractive index of the (spacetime-altered) vacuum. This widely known result has resulted in the development of refractive index models for GR (References 14-17) that have found application in problems such as gravitational lensing (Reference 18). The estimated electric or magnetic field strengths required to generate a given refractive index change given by standard GR theory (the Levi-Civita Effect) can be found in (Reference 19). In engineering terms, the velocity of light c is given by the expression c =1/Vp„e„ , where -t and c„ are the magnetic permeability and dielectric permittivity of undistorted vacuum space (po = 4/1- x10-7 Him and so = 8.854x 10-12 F/m). The generation of an effective refractive index n = g i /g oo # I by technological means can from an engineering viewpoint be interpreted as manipulation of the vacuum parameters p„ and so . In GR theory, such variations in /to' so and hence the velocity of light, c, are often treated in terms of a "THep" formalism used in comparative studies of gravitational theories (Reference 20). As discussed below, a number of striking effects can be anticipated in certain engineered spacetime regions. 5 (8) UNCLASSIFIED/ *P0.1‘8,PFPRIrL*SER.PI
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Document, cited by the archive. The PDF is mirrored here; the original link is above. 17 pages are in the text index: search them above, or from the library's search.