Causality and relativity in quantum physics
  It is argued here that the Copenhagen interpretation of quantum mechanics violates the tenets on which both Galileo's and Einstein's theories of relativity are based. It is postulated that the "building blocks" of the universe are not "particles" but are holistic wave-entitities which act and interact with other wave-entities as one would expect from waves. A new approach to model the free electron is presented. It is argued from Coulomb's law that the electromagnetic quantum-field energy is not part of an electric field surrounding the electron, but is localised, so that it is wholly equal to the mass of the electron. It is found that an energy component must also exist along a fourth spatial dimension which could be the origin of the "dark energy" in the universe and which, in turn, should be responsible for "vacuum-fluctuations" as governed by Heisenberg's uncertainty relationship for energy and time. The possible consequences of this approach are analysed and discussed. 
Johan F. Prins