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This question is vaguely related to an earlier question, but is more focused.

In a paper, Electromagnetic Mass, Charge, and Spin, which apparently is not peer-reviewed, the author relates a "matter field" to a spinor representation of the electromagnetic field. The author states that field momentum of the "matter field" is an eigenvector of a field stress-energy tensor:

We also demonstrate that condition (3) is equivalent to the requirement that momentum density of the matter field 𝑃𝜇 is an eigenvector of the stress-energy tensor of the electromagnetic field. [page 4]

Unfortunately I haven't learned how to work with spinors yet, so am not able to check or understand the author's math.

A) In general, under what conditions would field momentum - or a component thereof - be an eigenvector of the stress-energy tensor? B) Why should (or should not) this paper be taken seriously?

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  • $\begingroup$ I personally would not spend any time whatsoever on this paper because (1) the author is an “independent researcher” with no academic affiliations, and I can’t find him in Google Scholar; (2) ResearchGate has no quality standards as far as I know; the paper was likely rejected by arXiv; (3) the paper is 6 years old and has gotten only two self-citations according to ResearchGate. $\endgroup$ – G. Smith May 30 at 0:47
  • $\begingroup$ That was my inclination too. However, it seems only fair that the work should speak for itself. Wish I understood spinors. $\endgroup$ – S. McGrew May 30 at 2:02
  • $\begingroup$ Of A) and B), the former is my main interest: under what conditions would field momentum - or a component thereof - be an eigenvector of the stress-energy tensor? $\endgroup$ – S. McGrew May 31 at 1:34

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