The Foldy–Wouthuysen transformation
- 1 December 1995
- journal article
- Published by American Association of Physics Teachers (AAPT) in American Journal of Physics
- Vol. 63 (12) , 1119-1121
- https://doi.org/10.1119/1.18017
Abstract
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.Keywords
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