A new relativity principle for bodies in different gravitational   potentials
  A general principle of non-equivalence for bodies and observers in different G potentials (GP) was derived from correspondence of the Einstein's equivalence principle either with optical physics or with gravitational experiments in which bodies and observers are in different GP. According to it some relative physical changes occur to any well defined part of an object after a change of GP.. Such changes cannot be measured by observers travelling with the object because his instruments change in identical proportions. The same principle was derived from a new gravitational theory based on a particle model made up of photons in stationary states. Such model accounts for the inertial and gravitational properties of matter. This principle is not consistent with both, the classical hypotheses on the relative invariability of the bodies after a change of GP and with the G field energy hypothesis. The two kinds of errors are of the same magnitude and opposite signs. Such errors are cancelled but only when the two hypotheses are used. This accounts for the good predictions of general relativity for the classical gravitational tests. The new properties of the universe derived from the new principle, are radically different from the classical ones. They are more clearly consistent with the astronomical observations. 
Rafael A. Vera