Questioning the Equivalence Principle.

摘要

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: 'dilation' and 'moduli') with gravitational-strength couplings.