Classical Physics


Moment of the Poynting Vector is not Spin. V. 2

Authors: R. I. Khrapko

A common opinion that a moment of the Poynting vector is spin is a common delusion due to a serious defect of the general field theory. We present a circularly polarized Laguerre-Gaussian beam without an azimuth phase structure as an evidence of this. It is shown that the moment of the Poynting vector in this beam is an orbital angular momentum, not spin. Meanwhile, this beam, as well as a circularly polarized plane wave, clearly carries spin. But the standard electrodynamics does not sight it. Spin tensor of the standard electrodynamics is zero. So, this delusion causes many conflicts, vagueness, and paradoxes concerning electromagnetic angular momentum. The only way to resolve the problems is to use an electrodynamics spin tensor, which we introduced into the electrodynamics and demonstrate in this paper.

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Submission history

[v1] 25 Mar 2007

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