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Barceló, Boyanov, Garay, Martín-Martínez and Sánchez Velázquez analyse whether quantum matter can destabilise a warp drive spacetime. They search for points of infinite blueshift, which resemble a black hole's inner horizon with its semiclassical instability, and classify them by how nearby geodesics behave. Warp bubbles in 2+1 dimensions or more turn out likely to be stable: they contain only isolated divergent points, so the destabilising energy that accumulates stays finite. The causal structure found in the 1+1 case carries over to higher dimensions, at least along one axis. Any remaining instability from energy-density build-up can be reduced further with more aerodynamic bubble shapes and trajectories.

Warp Drive Aerodynamics