On the Independence of Electromagnetism and Gravitation from Test Bodies Physical Properties

Abstract

Does a physical field exist independently of the interaction between the field source and the test body used to measure it at a given point? What does propagate between two physical bodies when they interact? These are the fundamental questions we answer in the present work for electromagnetic and gravitational interactions. We come to the conclusion that gravitational fields as well as spacetime curvature cannot depend on the passive-gravitational to inertial mass ratio of the test bodies, because this would lead to energy conservation and causality violation except when this ratio is universally exactly equal to one. For what concerns the hypothetical dependence of electromagnetic fields on the charge to inertial-mass ratio of test bodies, this would call for the propagation of an operationally ill defined quantity (Coulomb . Meter$^2$ / Second$^2$) that would replace energy (Joule = Kilogram . Meter$^2$ / Second$^2$) transfer in the interaction between two electrically charged bodies. Hence electromagnetic fields cannot depend on the charge to inertial-mass ratio of test bodies. A consequence of these results is also the disqualification of Murat Ozer's unification theory of gravitation and electromagnetism.