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Issue		Eur. Phys. J. D Volume 8, Number 1, January 2000
Page(s)		9 - 12

Eur. Phys. J. D 8, 9-12

A theory of electromagnetism with uniquely defined potential and covariant conserved spin

A.B. van Oosten

Laboratoire de Physique Quantique, IRSAMC, Université Paul Sabatier 31062 Toulouse, France
oosten@irsamc2.ups-tlse.fr

Received 10 March 1999

Abstract
The Lagrangian ${1 \over 2} \epsilon_0 c^2 \partial_\mu A_\nu \partial^\mu A^\nu$is shown to yield a non-gauge-invariant theory of electromagnetism. The potential is uniquely determined by the inhomogeneous wave equation and boundary conditions at infinity. The Lorenz condition and minimal coupling follow from charge conservation. Electromagnetic spin is conserved and a spin operator is proposed without sacrificing covariance. Covariant quantisation is carried out without redefining the metric. It is a valid alternative to the standard approach since it makes the same experimental predictions.

PACS
03.50.De Classical electromagnetism, Maxwell equations - 42.50.-p Quantum optics

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