Equivalence Principle and Clocks

Abstract

String theory suggests the existence of gravitational-strength scalar fields ("dilaton" and "moduli") whose couplings to matter violate the equivalence principle. This provides a new motivation for high-precision clock experiments, as well as a generic theoretical framework for analyzing their significance.

7 pages, latex, uses moriond.sty, to appear in the Proceedings of the 34th Rencontres de Moriond, "Gravitational Waves and Experimental Gravity", January 1999