DOW-UAP-D135: Antigravity for Aerospace Applications - From a Ball of Dwarf-Star Matter to a Stack of Casimir Cavities

Source file: DOW-UAP-D135_ AAWSAP-DIRD-Antigravity-for-Aerospace-Applications-March-30-2010-V2.pdf Originating agency: Defense Intelligence Agency (DIA), Defense Warning Office, AAWSA Program Document type: Defense Intelligence Reference Document (DIRD), "Acquisition Threat Support" series; control number DIA-08-1003-018 Date: 30 March 2010; information cutoff date (ICOD): 1 December 2009 Classification: UNCLASSIFIED//FOR OFFICIAL USE ONLY (the FOUO caveat is struck through on every page; publicly released 2026) Page count: 44 VIRIN: 260918-D-D0360-1124 PURSUE Release: 6

Summary

DOW-UAP-D135 is a 44-page reference document prepared by the Acquisition Support Division (DWO-3) of the Defense Warning Office, Directorate for Analysis, DIA, under the AAWSAP program. The author's name is redacted and replaced with the label AAP Person 58, and the administrative note directs questions to AAP Person 1, the AAWSA Program Manager. It is a theoretical survey of every route by which established physics, from Newton's law of gravity through Einstein's general relativity to quantum field theory, permits, at least on paper, a force that cancels or reverses the Earth's pull.

The paper has five numbered chapters, ending with "The Way Forward," a technical appendix on sources of negative energy, five figures and 91 references, and contains some thirty numbered equations. The author attaches a numerical estimate to each mechanism, and those numbers are the heart of the document: a four-million-ton ball, a kilometer-scale torus, a negative-energy bubble as dense as a neutron star, or a force of 10^-14 newtons.

The conclusion cuts both ways. On one hand, the author writes, "plausible mechanisms exist" within Newtonian and general relativistic theory; on the other, every mechanical embodiment requires kilometer-sized apparatus, astronomical masses or extreme velocities. The author recommends funding one laboratory experiment, theoretically vetting a second proposal, and setting up a negative-energy research program. The paper does not mention UFOs, UAP or unidentified craft.

Research Article

Starting point: "Gravity is the bane of aerospace transportation"

The introduction frames an engineering problem. Every aircraft or spacecraft must carry propellant and tankage to overcome the Earth's pull, and in the author's words "the majority of propulsive energy is dedicated to overcome gravity." Newton's laws put a floor under the fuel fraction; for example, a single-stage rocket that accelerates to escape velocity "must be composed of more than 93 percent fuel." Current technology allows only "passive control" of gravity, thrust that counters the pull. "Active control," which would remove the effect of the gravity well, would let vehicles "levitate" and spend propellant only on changing velocity.

"Antigravity" is defined as a colloquial expression for the negation or repulsion of gravity, and "gravity control" as the broader term. Already in the introduction the author warns that many of these concepts "are nowhere near having any form of practicable engineering implementation," yet promises "theoretical estimates to guide the way toward technological implementation."

Newtonian physics: a four-million-ton ball

The simplest way to cancel Earth's gravity at a given spot is to place a second Earth-mass planet above it. As a "smaller" version the paper presents R. L. Forward's proposals: a ball of ultradense matter at dwarf-star or neutron-star density (10^11 to 10^18 kg per cubic meter), 32 cm across and weighing four million metric tons. Its surface gravity is 1 g, so placed near the ground it leaves everything between it and the Earth in free fall. The alternative is a disk 45 cm across and 10 cm thick: 2 g above it, a gravity-free region beneath its center. The verdict: "interesting antigravity machines," but not feasible, because there is no way to create and handle such matter.

The author adds an energy estimate for Newtonian levitation: nullifying the gravitational potential energy of one kilogram near the surface takes 62.5 megajoules, 2.05 times the kinetic energy needed to put it into low Earth orbit. For comparison the paper notes that rockets like the Air Force DC-XA can hover only as long as their fuel lasts.

General relativity: tori, catapults and the Felber effect

In general relativity, just as a moving electric charge produces a magnetic field, a moving mass produces an extra, "gravitomagnetic" component of the gravitational field. Its best-known consequence is frame dragging, the Lense-Thirring effect, in which "rotating bodies literally drag spacetime around themselves." The paper credits the foundations to Heaviside, Einstein (before 1916) and Thirring and Lense. The text gives 1883 for Heaviside, while the cited article is dated 1893 in the reference list.

On this basis Forward designed a "dipole gravitational field generator" (Figures 1 to 3): instead of a wire wound around a torus, a pipe carrying accelerated mass. The obstacle is the vacuum "gravitational permeability," 3.73 x 10^-26 m/kg. To produce a 1 g antigravity field one would have to accelerate dwarf-star-density matter "through pipes as wide as a football field wound around a torus with kilometer dimensions," at 10^11 m/s^2. A variant is a torus of dense matter turning inside-out "like a smoke ring." The author even sketches a network of "gravity catapults" across the solar system and the galaxy, through which travelers would jump from station to station.

Felber, using the exact Schwarzschild solution, showed that a mass approaching or receding from a payload faster than c divided by the square root of 3 (about 58 percent of light speed) repels it, "as seen by distant inertial observers." The paper explains that the effect has not been seen in the laboratory because it is second-order and higher in the source velocity, and says that inventing "a relativistic driver for a captured astronomical body" is so great a challenge that "this paper will not consider this concept any further."

Negative energy: a bubble around the vehicle

In general relativity, pressure as well as mass-energy produces gravity. Negative energy density, or negative pressure, produces gravitational repulsion; this is "exotic matter." The paper describes the "energy conditions" (WEC, NEC, DEC, SEC) formulated by Hawking and Ellis and argues that they "are mere hypotheses" violated by quantum effects. In a pointed passage it says negative energy's alarming reputation "is unfounded," because the conditions were shown experimentally to be false, it claims, 25 years before they were formulated. It lists natural examples: static radial electric or magnetic fields, squeezed quantum vacuum, gravitationally squeezed zero-point fluctuations, the Casimir effect, and certain Dirac field states. Faster-than-light travel, traversable wormholes and time machines are mentioned as possibilities outside the report's scope.

A "toy model" computes how much negative energy a thin spherical shell, a "bubble," around a vehicle would need to cancel Earth's gravity from the surface to low orbit. The result (Equation 11) is about -1.05 x 10^27 J/m^3 divided by the wall thickness in meters. For any realistic thickness this is a negative density on the order of a dwarf star or neutron star, and the author concludes that the challenge "is daunting." For context: negative energy densities relative to the vacuum do occur in Casimir cavities, but "quantum inequalities" limit their size and duration, and negative energy on a macroscopic scale has never been demonstrated. The paper cites a dissertation on those inequalities (Reference 84) only as the source of an equation and does not discuss what they mean for its model.

Dark energy: a reservoir that cannot be tapped

"Cosmological antigravity" already operates in the universe as accelerating expansion. The author shows that a radiation-dominated fluid attracts twice as strongly as Newton predicts, and that sufficiently negative pressure produces repulsion. The cosmological constant is equivalent to vacuum energy with negative pressure, and the vacuum, in the paper's words, "acts as a reservoir of unlimited energy." The author gives the cosmic budget, 74 percent dark energy and 26 percent matter (4 percent ordinary, 22 percent dark matter), and the supernova observations of Riess and Perlmutter. The paper states that the Higher-Z team found, at 98 percent confidence, that the dark-energy equation of state equals -1, and that "this result falsifies all quintessence models for cosmology." That is a sharper formulation than the observations are usually taken to support: they pin the parameter near -1, but slowly evolving models have remained a subject of research.

The practical line is short: dark energy density is about 10^-9 J/m^3, and all the dark energy in the solar system amounts to the mass equivalent of a small asteroid. It is therefore "highly unlikely, if not impossible" to harness for propulsion in the near future. A footnote adds that dark matter "has no beneficial application for breakthrough propulsion physics."

The quantum realm: Casimir cavities and levitating atoms

Quantum corrections to gravity sometimes include a repulsive term. The author relates that the example presented "was derived in 1984 by R. L. Forward and the author, with instruction provided by R. P. Feynman and M. Scadron, during a summer quantum gravity seminar sponsored by the Hughes Research Labs in Malibu, CA." The repulsive term's coefficient is about 10^-94 and affects only bound states at the atomic scale, so it has no measurable effect on any propulsion system.

A more practical proposal comes from Calloni et al.: the negative vacuum energy in a Casimir cavity, between two closely spaced metal plates, should "weigh" like a negative mass, so the cavity feels a tiny upward push. To magnify it they proposed a stack of a million cavities, each 35 cm across and 100 nm thick, with SiO2 layers, 10 cm thick in total. By modulating the effect through a superconducting transition they estimate a force of about 10^-14 N at tens of millihertz, "more than two orders of magnitude larger" than what the VIRGO gravitational-wave antenna is expected to detect; with a billion layers, about 10^-11 N. The author agrees the force is "quite feeble" but calls the idea "ripe for further exploration," provided the force can one day exceed the weight of the system.

Pinto extended Fermi's 1921 finding that an electric dipole in a gravitational field feels a "self-lifting" force. For two hydrogen atoms 20 Bohr radii apart the acceleration is about 4 x 10^-15 m/s^2. Pinto proposes magnifying the effect with Rydberg atoms, resonant laser enhancement (by factors of 10^3 to 10^5), laser-induced orientational averaging that turns the 1/r^6 potential into a gravity-like 1/r, and trapped clusters in which the force grows as the square of the number of atoms. His estimate is 1.5 g upward and a complete levitation thruster. The author lists the obstacles, from atoms evaporating out of the trap to ionization, and notes that Pinto's claim of no conflict with energy conservation "requires reevaluation because there are subtle boundary conditions involved that might have been overlooked."

"The Way Forward": what the author recommends

• Dipole field generators: overcome the density problem, for instance by cooling reactor neutrons, whose density is limited to about 10^-3 kg/m^3, and by examining "putative tetraneutrons" and Bose-Einstein (first made in 1995) and Fermionic (2003) condensates; and run a program to measure the "gravitational permeability" of all forms of matter, looking for a material that would be to gravity what iron is to magnetism. The paper also mentions Martin Tajmar's observations of an apparent frame-dragging effect near super-cooled rotating rings, which "were being reported but not yet independently confirmed."
• Negative energy: a dedicated program for squeezed-vacuum generators in quantum optics, study of other Casimir effects, follow-up of "dynamical Casimir effect" (moving-mirror) experiments, whose laboratory demonstration the author expects "before 2012" (such a demonstration was indeed reported in 2011 in a superconducting circuit), detectors for negative energy, and ways to trap and store it; in the author's opinion, "free-space negative energy sources" are preferable to stored negative energy.
• Calloni's proposal: "should be funded and performed by a high quality laboratory."
• Pinto's proposal: "should be theoretically evaluated prior to funding an experiment," since it "does contain enough rigor and credibility that it warrants a further look."

What the paper does not say, and its scientific standing

The paper does not mention UFOs, UAP, unidentified craft or the performance of observed objects, and does not tie the topic to any specific threat. Among AAWSAP's 12 technical areas it serves mainly lift, propulsion and control. It contains no experimental data of its own, no cost estimates and no development timeline, apart from the expected demonstration of the dynamical Casimir effect.

The physics it rests on, general relativity, the Casimir effect and dark energy, is established. The departure from consensus, as the official summary also notes, lies in the implication that practical propulsion could grow from it; the author concedes a gap of many orders of magnitude in almost every section. There are also some small errors: the Heaviside date conflict; footnote 14, which describes bosons as "spin-1 particles such as nucleons or atoms," although nucleons are spin-1/2 fermions; the Figure 2 caption ("Diople"); and cross-references to "Section II-A" and "III-C-2" that do not match the table of contents. The file name carries the suffix V2, and the administrative note speaks of a series "produced in FY 2009." The companion paper DOW-UAP-D134, which asks who is likely to deliver breakthroughs in energy and propulsion, including "antigravity," carries the same date.

Significance

Antigravity is one of the topics most closely associated with AAWSAP, and this paper is the program's baseline survey of it. Its main value is its honest orders of magnitude: almost every section ends with a number that shows the distance between "theoretically permitted" and "buildable." At the same time, the recommendations to fund an experiment on how vacuum energy gravitates and a program of negative-energy generators show the program's willingness to invest in speculative physics. The score of 6 reflects a detailed paper central to the program's themes that does not deal with UAP observations.

Key People

Locations

Key Concepts

Notable Quotes

"Gravity is the bane of aerospace transportation." -- page 6

"For example, this limit implies that a single-stage rocket that accelerates to escape velocity must be composed of more than 93 percent fuel." -- page 6

"While these are interesting antigravity machines, they are unfortunately not feasible from an engineering standpoint since one does not yet have the technology or means to create and handle ultradense compact matter." -- page 8

"Negative energy has the unfortunate reputation of alarming physicists." -- page 14

"The technical challenge to implement this kind of antigravity, however, is daunting." -- page 17

"On this basis, one can conclude that it is highly unlikely, if not impossible, that one will be able to invent a technology in the near future that can acquire and exploit a near-cosmological amount of dark/vacuum energy to implement a useful antigravity propulsion system." -- page 22

"Mechanical embodiments that produce antigravity forces require kilometer-sized apparatus, astronomical-sized masses and densities, or extreme mass velocities and accelerations." -- page 29

"Calloni et al.'s experimental proposal reviewed in Section IV-A should be funded and performed by a high quality laboratory." -- page 33