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Warp Drives are in principal possible The key idea is to contract space-time in front of you and to expand it behind The Alcubierre Metric does just this, and is consistent with Einstein's Theory of General Relativitypic.twitter.com/vQuzMH6Him
The Alcubierre metric does however have its difficulties, as it admits a negative (!) energy density However, an Alcubierre-warp drive could still be realized by exploiting certain quantum effects (e.g. Casimir Effect) whose stress-energy tensors also admit negative energiespic.twitter.com/uu3oAFYSEu
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 …
+1 for the minus sign highlight.
I guess negative energy an indirect consequence of Heisenberg principle ?
That minus-sign highlight :P
But π is negative so it's all good
but creating negative mass is reason for some optimismhttps://phys.org/news/2017-04-physicists-negative-mass.html …
Damit du weißt über was wir die ganze Zeit reden @CmPltLyShT 
Bahnhof?
I'll believe Warp Drives are actually possible when someone builds one. I've been waiting since the 1950s for commercial fusion energy. And at least we know fusion energy is real, just extremely difficult to build.
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