Wald, General Relativity, p. 411, says that Minkowski space is unstable in semiclassical gravity. He gives a reference to this paper:(adsbygoogle = window.adsbygoogle || []).push({});

Horowitz, "Semiclassical relativity: The weak-field limit," Phys. Rev. D 21, 1445, http://journals.aps.org/prd/abstract/10.1103/PhysRevD.21.1445

The Horowitz paper is paywalled and is not on arxiv. If true, this would seem to be a pretty serious indictment of semiclassical gravity. Is it true according to the current state of the art?

A search for citations of the Horowitz paper turned up the following:

Anderson, http://arxiv.org/abs/gr-qc/0209075

Hu, http://arxiv.org/abs/gr-qc/0402029

Hu, http://arxiv.org/abs/gr-qc/0508010

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# Stability of Minkowski space in semiclassical gravity?

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