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This Defense Intelligence Reference Document from the Defense Intelligence Agency is dated 11 January 2011. It was produced in FY 2010 under the Advanced Aerospace Weapons System Applications (AAWSA) Program. It reviews negative, or sub-vacuum, energy found in squeezed light and the Casimir effect, and explains quantum optical homodyne tomography as a way to measure and map that energy in the lab. It proposes balanced homodyne detector arrays that could help detect anomalous aerospace platforms using engineered spacetime propulsion.
UNCLASSIFIED//F8A 8FFI~Ie ■ 1!55 0111 Y Casimir_?---Y V / plates acuum fluctuations Figure 2. Schematic of the Casimir Effect. It turns out that there are many different types of Casimir effects found in quantum field theory [20-22, 26-28, 51]. For example, if one introduces a single infinite plane conductor into the Minkowski (flat spacetime) vacuum by bringing it adiabatically from infinity so that whatever quantum fields are present suffer no excitation but remain in their ground states, then the vacuum (electromagnetic) stresses induced by the presence of the infinite plane conductor produces a Casimir effect. This result holds equally well when two parallel plane conductors (with separation distanced) are present, which gives rise to the familiar Casimir effect inside a cavity. Note that in both cases, the spacetime manifold is made incomplete by the introduction of the plane conductor boundary condition(s). The vacuum region put under stress by the presence of the plane conductor(s) is called the Casimir vacuum. The generic expression for the energy density of the Casimir effect is Pee= -Ahcd-4 , where A= C,(D)/8n 2 in spacetimes of arbitrary dimension O [20-22]. The appearance of the zeta-function C,,(D) is characteristic of expressions for vacuum stress-energy tensors, T,~~ .ttt In our familiar 4-dimensional spacetime (D = 4) we have that A= n 2n20. To calculate for a given quantum field is to calculate its associated Casimir effect. We should also point out that the methods used to obtain the quantum vacuum electromagnetic T/1 ~~ between parallel plane conductors can also be used when the conductors are not parallel but are joined together along a line of intersection. If the conductors have curved surfaces instead, then one obtains results that are similar to the case of intersecting conductors. These geometries have also been evaluated for the ,-, The Greek tensor indices (p, v = Q__ 3) denote spacetime coordinates, x'l .. x 3, such that x1 x 3 = space coordinates and x" = time coordinate. Note in general that T 0'' = p~_ (field e,iergv de,isity). 14 UNCLASSIFIED/ ,'l"91t 91'1'11i1Ali Wili 0•11 X
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Report, from the dia collection. The PDF is mirrored here; the original link is above. 51 pages are in the text index: search them above, or from the library's search.