A new parameter κ is defined to capture charge-dependent equivalence principle violations, with existing experiments constraining |κ| < 2.1 × 10^{-4} kg/C at 95% CL, eleven orders weaker than composition bounds.
For a uniform, non-relativistic sphere of densityρ⊕ ≈ 5515 kg m−3, the characteristic curvature scale in natural units (ℏ = c = 1) is obtained from the Einstein field equations
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Toward Charge-Dependent Tests of the Equivalence Principle: A Phenomenological Parameter and an Unexplored Frontier
A new parameter κ is defined to capture charge-dependent equivalence principle violations, with existing experiments constraining |κ| < 2.1 × 10^{-4} kg/C at 95% CL, eleven orders weaker than composition bounds.