Minkowski spacetime is unstable in semiclassical gravity

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Abstract
We show that in the semiclassical theory of gravity, flat spacetime with quantum fields in the Minkowski vacuum is unstable to a certain type of infinitesimal perturbation. Moreover, these perturbations evolve into a catastrophic collapse in an arbitrarily short time scale. However, our universe is safe against these perturbations until some time far in the future.