Phys. Rev. D 21, 2742–2755 (1980)Quantum gravity and time reversibilityReceived 28 December 1979; published in the issue dated 15 May 1980 The meaning of time-reversal and CPT invariances of a theory is discussed both in the context of theories defined on flat spacetime as well as in general relativity. It is argued that quantum gravity cannot be time-reversal or CPT invariant; that an "arrow of time" must be fundamentally built into the theory. However, a weaker form of CPT invariance could still hold, in which case the fundamental "arrow of time" would not show up in the measurements of observers who perform scattering experiments. Consequences of this weaker hypothesis are explored. © 1980 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.21.2742
DOI:
10.1103/PhysRevD.21.2742
PACS:
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