Summary
It is shown that the first-order constants of motion of the free electromagnetic field are equal to sums of terms proportional to the difference of right and left circularly polarized photons with momentumk, the two pseudovector constants of motion being equal to each other and the three-pseudotensor constant being a symmetric quantity.
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References
S. Ragusa:Nuovo Cimento B,101, 121 (1988).
D. M. Lipkin:J. Math. Phys.,5, 696 (1964).
M. G. Calkin:Amer. J. Phys.,33, 958 (1960), has used a similar expansion.
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Ragusa, S. A Remark on the first-order conservation laws of the free electromagnetic field. Nuov Cim B 104, 117–121 (1989). https://doi.org/10.1007/BF02742830
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DOI: https://doi.org/10.1007/BF02742830