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Jul 24, 2018 at 21:33 history edited user4552 CC BY-SA 4.0
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Aug 19, 2013 at 21:27 comment added user4552 @fffred: It's not an ironclad symmetry argument. It would just be extremely strange if the photon were the only particle whose dipole moment was an independent degree of freedom, rather than being determined by its spin.
Aug 19, 2013 at 20:49 comment added fffred I don't understand the symmetry argument. Why couldn't it have a moment perpendicular to motion? The emitter might not be symmetrical as well.
Aug 19, 2013 at 17:28 history answered user4552 CC BY-SA 3.0