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Electrons In An External Field by L.D. LANDAU; E.M. LIFSHITZ is a scholarly article available to read on EtoBox.

What is Electrons In An External Field about?

The wave equations of free particles express essentially only those properties which depend on the general requirements of space-time symmetry. Physical processes involving the particles, however, depend on their interaction properties. In the relativistic theory it proves impossible to obtain by any simple generalisation of the wave equations a description of particles that are capable of strong interactions, i.e. a description going beyond the information contained in the equations for free particles. The wave-equation method, however, is applicable to the description of electromagnetic interactions of particles that are not capable of strong interactions. These include electrons (and positrons), and the very wide domain of electron quantum electrodynamics is therefore accessible to the existing theory. ## 1 " In this chapter we shall discuss problems of quantum electrodynamics which fall within the scope of single-particle theory. These are problems in which the number of particles is unchanged, and the interaction can be represented in terms of an external electromagnetic field due to sources whose state remains constant in the course of time. t There are also unstable particle

Author

L.D. LANDAU; E.M. LIFSHITZ

Publisher

Elsevier

Published

1974

Language

EN