Equivalence Principle Violations and Couplings of a Light Dilaton

Details Equivalence Principle Violations and Couplings of a Light Dilaton Equivalence Principle Violations and Couplings of a Light Dilaton

2010-07-16

arxiv.org/abs/1007.2792v2

Phys.Rev.D82:084033,2010

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

48 pages, 1 figure

Scientific paper

10.1103/PhysRevD.82.084033

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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