Light Clocks and the Clock Hypothesis

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11 Scopus citations


The clock hypothesis of relativity theory equates the proper time experienced by a point particle along a timelike curve with the length of that curve as determined by the metric. Is it possible to prove that particular types of clocks satisfy the clock hypothesis, thus genuinely measure proper time, at least approximately? Because most real clocks would be enormously complicated to study in this connection, focusing attention on an idealized light clock is attractive. The present paper extends and generalized partial results along these lines with a theorem showing that, for any timelike curve in any spacetime, there is a light clock that measures the curve's length as accurately and regularly as one wishes.

Original languageEnglish (US)
Pages (from-to)1369-1383
Number of pages15
JournalFoundations of Physics
Issue number11
StatePublished - Nov 1 2013
Externally publishedYes


  • Born rigid
  • Clock hypothesis
  • General relativity
  • Light clock
  • World-function

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