HHRG-118-GO06-20230726-SD005.pdf

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Defense 
Intelligence 
Reference 
Document 
Acquisition Threat Support 
29 March 2010 
ICOD: 1 December 2009 
DIA-08-1003-015 
Advanced Space Propulsion 
Based on Vacuum (Spacetime 
Metric) Engineering 
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Advanced Space Propulsion based on Vacuum (Spacetime 
Metric) Engineering 
Prepared by: 
(b)(3):10 USC 424 
Defense Intelligence Agency 
Author: 
(b)(6) 
Administrative Note 
COPYRIGHT WARNING: Further dissemination of the photographs in this publication is not authorized. 
This product is one in a series of advanced technology reports produced in FY 2009 
under the Defense Intelligence Agency, (b)(3) USC 424 
	
Advanced Aerospace 
Weapon System Applications (AAWSA)  Program. Comments or questions pertaining to 
this document should be addressed to (b)(3) 10 U…

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Contents 
Advanced Space Propulsion Based on Vacuum (Spacetime Metric) Engineering 	
iii 
Preface and Introduction 	
iii 
I. Spacetime Modification - Metric Tensor Approach 	
 1 
II. Physical Effects as a Function of Metric Tensor Coefficients 	
 2 
Time Interval, Frequency, Energy 	
3 
Spatial Interval 	
4 
Velocity of Light in Spacetime-Altered Regions 	
4 
Refractive Index Modeling 	
 5 
Effective Mass in Spacetime-Altered Regions 	
 6 
Gravity/Antigravity "Forces" 	
 6 
III. Significance of Physical Effects Applicable to Advanced Aerospace Craft 
…

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Advanced Space Propulsion Based on Vacuum (Spacetime 
Metric) Engineering 
Preface and Introduction 
A theme that has come to the fore in advanced planning for long-range space 
exploration in the future is the concept that empty space itself (the quantum 
vacuum, or spacetime metric) might be engineered to provide energy/thrust 
for future space vehicles. Although far reaching, such a proposal is solidly 
grounded in modern physical theory, and therefore the possibility that 
matter/vacuum interactions might be engineered for spaceflight applications 
is not a pri…

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components of potential utility involve very-small-wavelength, high-frequency 
field structures and thus resist facile engineering solutions. With regard to 
perturbation of the spacetime metric, the required energy densities predicted 
by present theory exceed by many orders of magnitude values achievable with 
existing engineering techniques. Nonetheless, one can examine the 
possibilities and implications under the expectation that as science and its 
attendant derivative technologies mature, felicitous means may yet be found 
that permit the exploitation of the enormous, as-y…

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I. Spacetime Modification - Metric Tensor Approach 
Despite the daunting energy requirements to restructure the spacetime metric to a 
significant degree, one can investigate the forms that such restructuring would take to 
be useful for spaceflight applications and determine their corollary attributes and 
consequences. Thus we embark on a "Blue Sky," general-relativity-for-engineers 
approach, as it were. 
As a mathematical evaluation tool, the metric tensor that describes the measurement of 
spacetime intervals is used. Such an approach, well known from …

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with the metric tensor coefficients 	
modifying the Minkowski flat-spacetime intervals 
dt, dr, 
 , and so forth, accordingly. 
As another example of spacetime alteration, in a spacetime altered by the presence of a 
charged spherical mass distribution (Q,m)at the origin (Reissner-Nordstrom-type 
solution), the above can be transformed into (Reference 11) 
Q 2G zlirece4 
1+ Gm/ rc2 r 2 +Gmi rc 2 )1 
—(1+ Gm/ rcl r 2 08' + sin' 041 
d.s? = 
-[ 
Q2G AZ60(4 
2 (1 Gm/rc2 )
2 
- G11 
C 2 
1+ Gm rc 
(5) 
with the metric tensor coefficients g 
again changed accordingly…

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TIME INTERVAL, FREQUENCY, ENERGY 
Begin by considering the case where Vg< I, typical for an altered spacetime metric in 
the vicinity of, say, a stellar mass, as expressed by the leading term in Equation (4). 
Local measurements with physical clocks within the altered spacetime yield a time 
interval igtmdt <di ; thus an interval of time dt between two events in an undistorted 
spacetime remotel from the mass—say, 10 seconds—would be judged by local (proper) 
measurement from within the altered spacetime to occur in a lesser time interval, 
Vgoodt<dt —say…