Equivalence Principle Violations and Couplings of a Light Dilaton

2010/07/19 by Thibault Damour, John F. Donoghue · 2 citations
Physics and Astronomy · #gr-qc #hep-ph #hep-th

paper · pdf · doi:10.1103/physrevd.82.084033

published as Phys.Rev.D82:084033,2010 · 48 pages, 1 figure

arxiv created 2010/07/19 · arxiv updated 2010/10/27

Abstract

We consider possible violations of the equivalence principle through the exchange of a light `dilaton-like' scalar field. Using recent work on the quark-mass dependence of nuclear binding, we find that the dilaton-quark-mass coupling induces significant equivalence-principle-violating effects varying like the inverse cubic root of the atomic number - A^-1/3. We provide a general parameterization of the scalar couplings, but argue that two parameters are likely to dominate the equivalence-principle phenomenology. We indicate the implications of this framework for comparing the sensitivities of current and planned experimental tests of the equivalence principle.

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