On "gauge renormalization" in classical electrodynamics

被引:6
|
作者
Kholmetskii, Alexander L. [1 ]
机构
[1] Belarusian State Univ, Minsk 220080, BELARUS
关键词
classical electrodynamics; energy-momentum tensor; gauge transformation;
D O I
10.1007/s10701-005-9039-3
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
In this paper we pay attention to the inconsistency in the derivation of the symmetric electromagnetic energy-momentum tensor for a system of charged particles from its canonical form, when the homogeneous Maxwell's equations are applied to the symmetrizing gauge transformation, while the non-homogeneous Maxwell's equations are used to obtain the motional equation. Applying the appropriate non-homogeneous Maxwell's equations to both operations, we obtained an additional symmetric term in the tensor, named as "compensating term". Analyzing the structure of this "compensating term", we suggested a method of "gauge renormalization", which allows transforming the divergent terms of classical electrodynamics (infinite self-force, self-energy and self-momentum) to converging integrals. The motional equation obtained for a non-radiating charged particle does not contain its self-force, and the mass parameter includes the sum of mechanical and electromagnetic masses. The motional equation for a radiating particle also contains the sum of mechanical and electromagnetic masses, and does not yield any "runaway solutions". It has been shown that the energy flux in a free electromagnetic field is guided by the Poynting vector, whereas the energy flux in a bound EM field is described by the generalized Umov's vector, defined in the paper. The problem of electromagnetic momentum is also examined.
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页码:715 / 744
页数:30
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