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Disagree, unless I'm understanding this wrong, but the conditions described in the paper are flat space-time and massless scalar field which are only achieved under "exotic" scenarios and to my knowledge have never been observed
the point i was making isn't that they showed this in a qft on a curved spacetime, but that the classical casimir effect admits a negative energy density .. knowing how this generalizes to a curved manifold would require quantum gravity
So maybe a more correct sentence would be "Warp Drives are not impossible in current understanding of nature"
That’s what it means for something to be in principle possible
If the separation between the plates isnt on the order of the planck length you can get away with 'semiclassical einsteins equations' where the curvature is sourced by the expectation value of T_{/mu /nu}
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