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This Defense Intelligence Reference Document, dated 30 March 2010, was prepared by the Defense Intelligence Agency's Defense Warning Office under the Advanced Aerospace Weapon System Applications Program. It reviews theoretical approaches to antigravity for aerospace propulsion. These range from Newtonian mass arrangements and general relativistic gravitomagnetic effects to negative energy, dark energy and quantum vacuum forces. The report concludes that many of these concepts are nowhere near practical engineering implementation. It offers theoretical estimates to guide future work.
From the source: Release of 2026-09-18 Incident: 3/30/10, 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 surveys a range of proposed “antigravity,” or gravitational control, concepts for aerospace applications, drawing mainly from Newtonian gravity, general relativity, cosmology, and quantum field theory to hypothesize that gravity might someday be reduced, counteracted, or redirected as a means of propulsion. The report reviews mechanisms including ultra-dense matter, gravitomagnetic effects, relativistic moving masses, negative energy, dark or vacuum energy, and quantum vacuum or dispersion-force approaches, while presenting some of these ideas as theoretically permissible under extreme, idealized conditions within established physics. However, it notes that any practical implementation faces currently insurmountable engineering barriers, including astronomical energy requirements, currently unproven exotic matter conditions, kilometer-scale or otherwise unbuildable apparatuses, and highly immature experimental foundations. Although the report draws on broadly accepted theoretical concepts, its implication that those concepts might eventually yield viable “antigravity” propulsion systems deviates significantly from mainstream physics consensus.
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theoretical poss ibi lity of antigravity also appears in quantum gravity theories,
cosmological vacuum or dark energy, and quantum field theory. This report reviews all
of these top ics. The report will also review the topics of gravity control that include the
production of antigravity (self-lifting) forces induced by quantum vacuum zero-point
energy and by nonretarded quantum interatomic dispersion forces in a curved
spacetime (that is, in a background gravitational field). The reader should bear in mind
that many of these concepts are nowhere near having any form of practicable
engineering implementation. However, the report will provide theoretical estimates to
guide the way toward technologica l implementation of antigravity.
II. Concepts for Antigravity Within Newtonian Physics
The basic form of Newton's law of gravity is given by the standard expression for the
gravitational force {Fgrav) that mutually acts between two masses (Reference 1):
(1)
where the negative sign indicates t hat Fgrn" is a (mutual) force of attraction, G is
Newton's universal gravitation constant (6.673 x 10-11 Nm 2/kg 2), m 1 and m 2 are two
interacting masses, and r is the radial distance between the two masses (note: MKS
units are used throughout). Observe in Equation (1) that the force of gravity acting on
a small test mass becomes stronger when the other (gravitating) mass is larger in
magnitude or when the distance between them is very small, or both. Also recall that
Equation (1) and Newton's second law of motion (F = ma) t o define the magnitude of the
gravitational acceleration a8 that acts on a small test mass m due to a larger
(gravitating) mass M (Reference 1):
GM
a g = - ? (2)
r-
If Earth is chosen to be the larger gravitating mass so that M = M@(5.972 x 1024 kg),
then according to Equation (2) a small test mass m placed near the Earth's surface,
whereby r~ R @ (6.378 x 106 m), will experience a downward gravitational acceleration
of a g = g = 9.81 m/s2 .
NEGATING NEWTONIAN GRAVITY
It is possible to design an antigravity machine that can nullify Earth's gravity field using
Newton's law of gravity . One way to use Equation (1) to nullify the Earth's gravitational
pull at a particular location would be to locate another planet of equal mass above that
location (Reference 2,3). The forces from the two Earth masses will cancel each other
out over a broad region between them . Everything within this broad region will be in
free fall. However, this is not a practical solution for aerospace flight since there is no
way to manipulate and control another planetary sized body.
Along similar lines, Forward (Reference 2,3) suggested to consider using a ball of
ultradense compact matter, corresponding to dwarf star or neutron star matter (~ 1011
- 10 18 kg/m 3), having a diameter of 32 cm and a mass of 4 million metric tons. This
ultradense ball will have a surface gravitational (attractive) force of 1-g. This small
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