Quantum Gravity and String Theory


Is Empty Spacetime a Physical Thing?

Authors: Diego Meschini, Markku Lehto

This article deals with empty spacetime and the question of its physical reality. By "empty spacetime" we mean a collection of bare spacetime points, the remains of ridding spacetime of all matter and fields. We ask whether these geometric objects -- themselves intrinsic to the concept of field -- might be observable through some physical test. By taking quantum-mechanical notions into account, we challenge the negative conclusion drawn from the diffeomorphism invariance postulate of general relativity, and we propose new foundational ideas regarding the possible observation -- as well as conceptual overthrow -- of this geometric ether.

Comments: 23 Pages. Published in Foundations of Physics, 36, 1193-1216, 2006.

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[v1] 2012-02-29 03:26:28

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