Questioning the Equivalence Principle

Abstract

The Equivalence Principle (EP) is not one of the ``universal'' principles of physics (like the Action Principle). It is a heuristic hypothesis which was introduced by Einstein in 1907, and used by him to construct his theory of General Relativity. In modern language, the (Einsteinian) EP consists in assuming that the only long-range field with gravitational-strength couplings to matter is a massless spin-2 field. Modern unification theories, and notably String Theory, suggest the existence of new fields (in particular, scalar fields: ``dilaton'' and ``moduli'') with gravitational-strength couplings. In most cases the couplings of these new fields ``violate'' the EP. If the field is long-ranged, these EP violations lead to many observable consequences (variation of ``constants'', non-universality of free fall, relative drift of atomic clocks,...). The best experimental probe of a possible violation of the EP is to compare the free-fall acceleration of different materials.

14 pages, contribution to the ONERA workshop on "Missions spatiales en physique fondamentale" (Chatillon, 18-19 Jan 2001), to appear in a special issue of the Comptes Rendus de l'Academie des Sciences (Paris), edited by C. Borde and P. Touboul

References in corpus (3)

• Further Evidence for Cosmological Evolution of the Fine Structure Constant
• The Confrontation between General Relativity and Experiment
• Little String Theory at a TeV

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• Gravitational Coupling, Dynamical Changes of Units and The Cosmological Constant Problem
• Reinterpreting the Pioneer anomaly and its annual residual