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We relate possible cosmological variations in the mass ratio mu \equivm_p/m_e and the fine structure constant alpha to long-rangecomposition-dependent forces mediated by a scalar field. The differentialacceleration eta in Eotvos-type experiments is bounded below by 10^{-14},except in cases where one or more scalar couplings vanish. We consider whatvalues for these couplings could arise from unified theories. By consideringthe contribution of the scalar field to the cosmological energy density we usebounds on eta to put upper bounds on the current rate of change of mu andalpha.Comment: 15 page

Composition-dependent long range forces from varyingmp/me

Composition-dependent long range forces from varyingm_p/m_e