A warp bubble can look orderly when its shape is prescribed in advance. A 2026 study asked what happens when an Alcubierre-shaped field becomes the starting point for an evolving mathematical solution instead. Under the authors’ chosen inertial-motion assumption, neighbouring trajectories crossed, forming caustics and destroying the description of a smooth field with one velocity at each location.
The result concerns a particular theoretical construction, not a laboratory warp drive or a proof that every conceivable warp geometry must fail. It highlights a basic requirement for any physical proposal: specifying an attractive spacetime shape is different from explaining how that shape forms and survives.
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