Momentum of an electromagnetic wave in dielectric media

Details Momentum of an electromagnetic wave in dielectric media Momentum of an electromagnetic wave in dielectric media

2007-10-02

arxiv.org/abs/0710.0461v2

Rev.Mod.Phys.79:1197-1216,2007

Physics

Classical Physics

23 pages, 3 figures, RevTeX 4. Removed erroneous factor of mu/mu_0 from Eq.(44)

Scientific paper

10.1103/RevModPhys.79.1197

Almost a hundred years ago, two different expressions were proposed for the energy--momentum tensor of an electromagnetic wave in a dielectric. Minkowski's tensor predicted an increase in the linear momentum of the wave on entering a dielectric medium, whereas Abraham's tensor predicted its decrease. Theoretical arguments were advanced in favour of both sides, and experiments proved incapable of distinguishing between the two. Yet more forms were proposed, each with their advocates who considered the form that they were proposing to be the one true tensor. This paper reviews the debate and its eventual conclusion: that no electromagnetic wave energy--momentum tensor is complete on its own. When the appropriate accompanying energy--momentum tensor for the material medium is also considered, experimental predictions of all the various proposed tensors will always be the same, and the preferred form is therefore effectively a matter of personal choice.

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