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Unfortunately the Casimir Effect only exhibits a *lower* but still positive energy density as compared to its surroundings. Not negative energy which is still unobserved.
in the context of quantum field theory the casimir effect does admit a negative energy density .. see equation (3) and thereabout https://arxiv.org/pdf/gr-qc/9510071.pdf …
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
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