The Foldy-Wouthuysen transformation

Details The Foldy-Wouthuysen transformation The Foldy-Wouthuysen transformation

1995-03-23

arxiv.org/abs/hep-ph/9503416v1

Am.J.Phys. 63 (1995) 1119

Physics

High Energy Physics

High Energy Physics - Phenomenology

Standard LaTeX, 6 pages

Scientific paper

10.1119/1.18017

The Foldy-Wouthuysen transformation of the Dirac Hamiltonian is generally taught as simply a mathematical trick that allows one to obtain a two-component theory in the low-energy limit. It is not often emphasized that the transformed representation is the only one in which one can take a meaningful *classical limit*, in terms of particles and antiparticles. We briefly review the history and physics of this transformation.

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