2010

Equivalence Principle Violations and Couplings of a Light Dilaton

Damour, Thibault, Donoghue, John F.

Understand

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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