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We consider possible tests of the Einstein Equivalence Principle forquantum-mechanical vacuum energies by evaluating the Lamb shift transition in aclass of non-metric theories of gravity described by the \tmu formalism. Wecompute to lowest order the associated red shift and time dilation parameters,and discuss how (high-precision) measurements of these quantities could providenew information on the validity of the equivalence principle.Comment: 4 pages, latex, epsf, 1 figur

TEST OF THE EQUIVALENCE PRINCIPLE USING ATOMIC VACUUM ENERGY SHIFTS