Quantum physics causal models

Since, in this causal model, the extended wave 0 represents a real physical finite wave with well-defined energy, it seems natural to represent it by a suitable mathematical form. At the time when de Broglie put forth his causal interpretation of quantum mechanics, it was necessary for him to construct a finite wave using the Fourier analysis, namely, the multiplicity of harmonic plane waves, infinite in space and time, summing up and giving origin to a wavepacket. 

Iam deliberately sticking to the Molecular Mechanics model here. As we all know, from a quantum physical perspective, the process of a molecule absorbing and exchanging energy is in fact irreducibly discrete. The fact that quantum physics poses some severe problems for the process account of causality, however, is readily admitted by Salmon. 

More severe conceptual problems arise in relativistic quantum mechanics, where the analogous scheme leads to completely non-physical results. In the process leading to formal localization and to complete uncertainty of momentum information, the information on the reference frame itself is lost, consequently, one can no longer determine what events can be regarded as simultaneous. Consequently, a conventional, classically interpreted localization approach within a relativistic quantum mechanical framework leads to nonsensical results. For example, if one assumes that localization is possible [6] and, as an initial condition, a relativistic particle is forced to be fully localized at some time t = 0, then the complete uncertainty of the reference frame implies that the same particle is already spread over the whole space at any later time t > 0. Within such a model causality is lost, and the relativistic model itself becomes self-contradictory [6],... 

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