The behaviour of rods and clocks in general relativity, and the meaning of the metric field

Details The behaviour of rods and clocks in general relativity, and the meaning of the metric field The behaviour of rods and clocks in general relativity, and the meaning of the metric field

2009-11-23

arxiv.org/abs/0911.4440v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages

Scientific paper

The notion that the metric field in general relativity can be understood as a property of space-time rests on a feature of the theory sometimes called universal coupling -- the claim that rods and clocks "measure" the metric in a way that is independent of their constitution. It is pointed out that this feature is not strictly a consequence of the central dynamical tenets of the theory, and argued that the metric field would better be regarded as a (possibly emergent) field in space-time, rather than as the very fabric of space-time itself.

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