Abstract
A simple mathematical extension of quantum theory is presented. As well as opening the possibility of alternative methods of calculation, the additional formalism implies a new physical interpretation of the standard theory by providing a picture of an external reality. The new formalism, developed first for the single-particle case, has the advantage of generalizing immediately to quantum field theory and to the description of relativistic phenomena such as particle creation and annihilation.
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Sutherland, R.I. Density Formalism for Quantum Theory. Foundations of Physics 28, 1157–1190 (1998). https://doi.org/10.1023/A:1018850120826
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DOI: https://doi.org/10.1023/A:1018850120826