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The physics of gravitational field propulsion explain all of the key performance characteristics of AAVs reported around the world for at least 70 years:

• Silent hovering with no atmospheric turbulence or other form of reaction mass-energy below the craft
• Dramatic instantaneous or at least virtually instantaneous accelerations
• Hairpin accelerations at hypersonic velocities with no subjective g-forces
• Transmedium travel between space, air and sea
• Absence of sonic booms regardless of speed
• Superluminal spaceflight without any time dilation effects

In fact, once a gravitational field propulsion system is charged, it requires no energy to accelerate the craft, because the craft doesn't technically acquire any momentum or energy - it simply distorts the field of spacetime to change position.

If you'd like to know more, you can read this thread:  UFO propulsion, metric engineering, and horizon physics

Or you could simply start with this academic physics paper which covers the basic principles in the context of general relativity:

“The warp drive: hyper-fast travel within general relativity,” Miguel Alcubierre, Classical and Quantum Gravity, 1994

Or you could read this much simpler paper which conveys the same basic ideas in the language of Newtonian physics:

“Negative matter propulsion,” Robert L. Forward, Journal of Propulsion and Power, 1990

Both papers convey the central operational principle of these craft with equal physical validity, but theoretical physicists generally prefer the Alcubierre form of the concept because it's a bit more rigorous.