https://doi.org/10.1007/s10053-000-8801-5
A theory of electromagnetism with uniquely defined potential and covariant conserved spin
Laboratoire de Physique Quantique, IRSAMC, Université Paul Sabatier 31062 Toulouse,
France
Received:
10
March
1999
Published online: 15 January 2000
The Lagrangian
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
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000
