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Re:Quantum researchers able to split one photon into three by tempay on Sunday March 01, 2020 @05:48PM (#22459948)
> the vacuum we know is meta-stable

It's not fully known if this is the case or not. If the standard model is accurate (which is a big if) then it's probably metastable but there is some still room for debate. See page 52 of https://arxiv.org/pdf/1707.08124.pdf

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