We test the Principle of Equivalence for particles and antiparticles, using CPLEAR data on tagged K0 and decays into [pi]+[pi]-. For the first time, we search for possible annual, monthly and diurnal modulations of the observables [eta]+- and [phi]+-, that could be correlated with variations in astrophysical potentials. Within the accuracy of CPLEAR, the measured values of [eta]+- and [phi]+- are found not to b...
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