Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
1997-02-21
Phys.Lett. B415 (1997) 8-14
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
6 pages; ReV_TeX 3.0; two-column format. Revisions: Central definitions and results essentially unchanged. Discussion of the r
Scientific paper
10.1016/S0370-2693(97)01226-4
In this note I introduce the notion of the ``reliability horizon'' for semi-classical quantum gravity. This reliability horizon is an attempt to quantify the extent to which we should trust semi-classical quantum gravity, and to get a better handle on just where the Planck regime resides. I point out that the key obstruction to pushing semi-classical quantum gravity into the Planck regime is often the existence of large metric fluctuations, rather than a large back-reaction. There are many situations where the metric fluctuations become large long before the back-reaction is significant. Issues of this type are fundamental to any attempt at proving Hawking's chronology protection conjecture from first principles, since I shall prove that the onset of chronology violation is always hidden behind the reliability horizon.
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