John E. Brandenburg, PhD presents Gravity Modification Based the GEM Effect, focused on two unified field theories that follow the Einstein concept that gravitation and electromagnetism can be unified separately from the short-range nuclear forces.
The PDF explains that both theories are based on the connection of gravitation to the Poynting vector of electromagnetism and suggest that direct gravity modification by electromagnetic fields may be possible. His talk introduces the Vacuum Bernoulli Equation, or VBE, which makes quantitative predictions about the degree of gravity modification.
Brandenburg describes a laboratory experiment using a 170 gram coil from a miniature electric race car motor energized with Tesla three-phase power, Galinstan liquid metal contacts, and frequencies around 400 Hz. The coil reportedly experienced a gravity force change corresponding to a loss of approximately 0.15 grams while energized, with null tests confirming no electromagnetic interference with the weight measurement.