On the detectability of quantum spacetime foam with gravitational-wave interferometers

Details On the detectability of quantum spacetime foam with gravitational-wave interferometers On the detectability of quantum spacetime foam with gravitational-wave interferometers

1999-09-05

arxiv.org/abs/gr-qc/9909017v1

Phys.Lett. B477 (2000) 424-428

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Submitted to Phys. Lett. B

Scientific paper

10.1016/S0370-2693(00)00233-1

We discuss a recent provocative suggestion by Amelino-Camelia and others that classical spacetime may break down into ``quantum foam'' on distance scales many orders of magnitude larger than the Planck length, leading to effects which could be detected using large gravitational wave interferometers. This suggestion is based on a quantum uncertainty limit obtained by Wigner using a quantum clock in a gedanken timing experiment. Wigner's limit, however, is based on two unrealistic and unneccessary assumptions: that the clock is free to move, and that it does not interact with the environment. Removing either of these assumptions makes the uncertainty limit invalid, and removes the basis for Amelino-Camelia's suggestion.

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