spacetime exhibit asymmetry, then I guess you could exploit it to create a reactionless drive.
The startrek Warp-drive does this, doesnt it?
Conservation of energy, linear momentum and angular momentum are the result of the fundamental displacement and rotational symmetries of spacetime (Noether's first theorem -- any differentiable symmetry of the action of a physical system has a corresponding conservation law). If you could somehow make spacetime exhibit asymmetry, then I guess you could exploit it to create a reactionless drive.
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