The Dirac Equation
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For almost 100 years a major goal of physics has been to understand the electron. Although such a desire may not seem excessive, it nevertheless is far from being realized on a fundamental level. A great deal of the effort that has been expended in the classical domain is reviewed in the Appendix, where we see that only the nonrelativistic, finite-size model appears to be completely well behaved. [Some recent progress has been booked, however, in the covariant formulation of an extended model [e.g., Schwinger (1983), Beil (1989).] Yet all experimental evidence still fails to reveal any structure for the particle. Whether or not one has faith in the ultimate existence of point particles, that is what is currently indicated by the data. Lacking any experimental definition or direction to the contrary, that is also the generally accepted model today, and the one we shall continue to follow for the moment in the quantum domain.
KeywordsCommutation Relation Dirac Equation Rest Frame Lorentz Transformation Dirac Particle
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