The preceding chapter, entitled “Relativistic Quantum Mechanics” did not really deal with quantum mechanics. The theory so far has no consistent interpretation because it suffers from two defects: (i) The hamiltonian operators are unbounded from below and, (ii) there is no many-particle formulation of the classical Dirac theory. These defects will now be removed. We concentrate first on the second problem (ii). In the course of its treatment, problem (i) will be solved, too.
KeywordsPair Production Vacuum Polarization Absorption Operator Commutation Rule Causal Function
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