The adverse drive was a abstract angle for an "engine" which would actualize a non-conservative gravitational acreage with non-zero curl. It was argued that in such circumstances, the ancillary of the acreage which creates added force on the aircraft will advance the aircraft in the administration of the force.
One abstraction for acumen this abstraction complex academic particles with abrogating mass, originally proposed by Robert Forward and Jamie Woodward. If one were to assemble a block of abrogating mass, and again attach it to a accustomed "positive" mass, the abrogating accumulation would abatement appear the absolute as does any accumulation against any other. On the added hand, the abrogating accumulation would accomplish "negative gravity", and appropriately the absolute accumulation (the spaceship itself generally) would abatement abroad from the abrogating mass. If abiding properly, the ambit amid the two would not change, while they connected to advance forever. It has been argued that adherence issues ability arise.
the abstraction is illustrated according to Millis by :
where :
is the gravitational scalar potential
is Newton's Gravitational Constant
is accustomed mass
is distance
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