The theoretical basis for warp drive devices, reviewed in Part I, reveals that three basic schemes require a negative stress-energy tensor to solve Einstein's field equations implying the use of negative or exotic matter to reach near light speeds. These propulsion approaches create a curvature in space-time at relativistic conditions inferring that gravity is also altered. The accumulated knowledge on sensing a gravitational potential at relativistic speeds is currently inadequate and with so much uncertainty, contrary theoretical outcomes result. Even so, another potential way of remedying the negative stress-energy conditions may require an approach akin to the Yilmaz description to compensate for Einstein's shortcomings in describing gravity. The issue of exceeding light speed from Einstein's original formulation is examined as well as the possibility that electric and magnetic fields may be redefined by introducing additional vector and scalar potentials. Thus, if an approach suggests generation of negative energy is feasible by exploiting the electric scalar potential, then addition of a magnetic scalar potential may also mitigate the problem. New formulations and the definition of suitable experiments to examine these premises are discussed. Such analyses are crucial to validate that these shortcomings, involving exotic matter, are not imaginary and that the concepts can be placed upon a more stable scientific footing.
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