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Comptes Rendus Physique
Volume 5, n° 8
pages 821-828 (octobre 2004)
Doi : 10.1016/j.crhy.2004.06.003
Metrology and general relativity
Métrologie et relativité générale.
 

Bernard Guinot
Observatoire de Paris, 61, avenue de lʼObservatoire, 75014 Paris, France 

Abstract

The accuracy of the measurement of time has led to a reconsideration of metrology in the framework of general relativity. This theory, which up to now has passed successfully all experimental tests, keeps the invariance of physical laws, but restricts it as a local property. However, the main applications of the time standards involve a large extension in space: the whole Earth, the solar system and farther. For example, one of the most striking applications is the development of satellite positioning systems that everyone uses: such systems would not operate without a rigorous relativistic treatment. The role of measurements in extended spatial domains is therefore examined. To cite this article: B. Guinot, C. R. Physique 5 (2004).

The full text of this article is available in PDF format.
Résumé

Lʼexactitude des mesures de temps a conduit à une réflexion sur la signification de la métrologie dans le cadre de la relativité générale. Cette théorie qui a jusquʼà présent subi avec succès lʼépreuve de lʼexpérience conserve lʼinvariance des lois de la physique, mais la restreint au domaine local. Or, les principales applications des étalons de temps mettent en jeu une grande étendue spatiale : la Terre, le système solaire et au-delà. Par exemple, une des plus frappantes applications est lʼétablissement de systèmes satellitaires de positionnement que chacun utilise, parfois sans le savoir. De tels systèmes ne sauraient fonctionner sans un traitement relativiste rigoureux. Le rôle des mesures dans un espace étendu est donc examiné. Pour citer cet article : B. Guinot, C. R. Physique 5 (2004).

The full text of this article is available in PDF format.

Keywords : General relativity, Time standards, Satellite positioning systems, Measurements in extended spatial domains

Mots-clés : Relativité générale, Étalons de temps, Systèmes satellitaires de positionnement, Mesures dans un espace étendu




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