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This Defense Intelligence Reference Document, dated 29 March 2010 and prepared by the Defense Intelligence Agency's Defense Warning Office, is one of a series of FY 2009 advanced technology reports under the Advanced Aerospace Weapon System Applications Program. It uses a metric tensor approach from general relativity to catalog the physical effects of engineering spacetime. It covers time alteration, light speed, effective mass, and warp drives. It concludes that these effects are consistent with physics, but that engineering them remains a daunting constraint.
From the source: Release of 2026-09-18 Incident: 3/29/10, Las Vegas, Nevada. Released with redactions. This document is a Defense Intelligence Reference Document (DIRD), a technical reference format used by the Defense Intelligence Agency (DIA) to capture baseline knowledge on a specific topic for later analytic use. DIRDs are best understood as reference and synthesis products rather than as original research. It is one of 38 DIRDs produced under the Advanced Aerospace Weapon System Applications Program (AAWSAP) between 2009 and 2011. Because AAWSAP’s scope permitted a broad range of supporting topics, not every DIRD in the series directly concerns aerospace systems or future threat assessment. The following summary reflects the DIRD’s scope and framing at the time of writing and should not be read as implying current validation of the concepts discussed. This DIRD examines the idea of vacuum or spacetime-metric engineering: the possibility that an unspecified future technology might alter the structure of spacetime in ways useful for propulsion, power generation, or extremely rapid long-distance travel. Using general relativity as a model-independent framework, it explores the physical effects that would theoretically follow if such metric changes could be artificially induced, including altered time rates, changes in effective mass, modified light propagation, gravity-like effects, and warp-drive propulsion. The document does not propose any mechanism for generating these effects and treats these physical consequences as an assumed result of spacetime manipulation rather than as the outcome of a practical engineering pathway. It also emphasizes that the energy requirements predicted by current theory to create such effects are far beyond existing technological capability.
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Effective Mass in Spacetime- Altered Regions
In a spacetime-altered region, E =mc2 still holds in terms of local ("proper coord inate")
measurements, but now energy E and the velocity of light c take on altered values as
observed from an exterior (undistorted) spacetime region. Reference to the definitions
for E and c in Table 1 permits one to define an effective mass as seen from the exterior
undistorted region as therefore taking on the value m ➔ m( - g 11 )/-Jg;;;, provid ing a
sixth entry for our table. Depending on the values of g00 and g11 , the effective mass
may be seen from the viewpoint of an observer in an undistorted spacetime region to
have either increased or decreased.
Gravity/Antigravity " Forces"
Strictly speaking, from the GR point of view, there are no gravitational "forces" but
rather (in the words of GR theorist John Wheeler) "matter tells space how to curve, and
space tells matter how to move." (Reference 21) As a result, Newton's law of
gravitational attraction to a central mass is therefore interpreted in terms of the
spacetime structure as expressed in terms of the metric tensor coefficients, in th is case
as expressed in Equation ( 4) above. Therefore, in terms of the metric coefficients,
gravitational attraction in this case derives from the cond ition that g00 1. As
for the possibility for generating "antigravitational forces," noted in equation (5),
inclusion of the effects of charge led to metric tensor contributions counter to the
effects of mass-that is, to electrogravitic repulsion. This reveals that conditions under
which, say, the signs of the coefficients g00 and g 11 could be reversed would be
considered (loosely) as antigravitational in nature. A seventh entry in Table 1
represents these features of metr ic sign ificance .
III. Significance of Physical Effects Applicable to Advanced
Aerospace Craft Technologies as a Function of Metric
Tensor Coefficients
As in Section III, metric tensor coefficients define the relationship between locally and
remotely observed (that is, spacetime-altered and unaltered) variables of interest as
listed in Table 1, and in the process define corollary physical effects. Table 1 thereby
constitutes a useful reference for interpreting the physical significance of the effects of
the alteration of spacetime variables. The expressions listed indicate specific spacetime
alteration effects, whether owing to natural causes (for example, the presence of a
planetary or stellar mass) or as a result of metric engineering by advanced
technological means as might be anticipated in the development and deployment of
advanced aerospace craft.
TIME ALTERATION
With regard to the first table entry (time interval), in a spacetime-altered region, time
intervals are seen by a remote (unaltered spacetime) observer to vary as
1/fg; re lative to the remote observer. Near a dense mass, for example, -Jg;;;< 1, and
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