This DIA reference surveys proposed gravity-control effects from Newtonian mechanics, general relativity, cosmology, Casimir physics, and quantum models. Its engineering assessment is restrictive: no active-gravity technology existed, laboratory effects were minute, and useful devices would require extreme mass, energy density, acceleration, scale, or amplification that had not been demonstrated.

This DIA reference explores whether hypothetical control of extra dimensions could change local dark-energy density and create a warp-like spacetime bubble. The proposal remains theoretical: dark energy and extra dimensions were not understood or controllable, and even the reduced energy estimates exceeded foreseeable capability.

This DIA reference reviews traversable-wormhole geometry and possible sources of negative energy. Quantum effects can produce small local negative-energy regions, but the report finds standard Casimir and moving-mirror methods inadequate for macroscopic engineering and says general relativity provides no assembly instructions.

This 57-page DIA reference report reviews theoretical proposals and selected experiments concerning extraction of energy from the quantum vacuum. It distinguishes established quantum-vacuum and Casimir phenomena from the unproven proposition of useful continuous energy conversion: the report says standard QED does not support that conversion, regards competing frameworks as inadequate or incomplete, and calls for further theoretical and experimental work.

This 51-page DIA reference report reviews laboratory-scale negative-energy states and proposes quantum optical homodyne tomography to measure squeezed-light and Casimir-vacuum fluctuations. It separates observed microscopic effects from speculative aerospace applications, stressing that access to larger, longer-lived negative-energy distributions is unknown and that quantum-inequality constraints remain experimentally unsettled.