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  • $\begingroup$ So far it seems to me that Hawking or Unruh radiation are the only candidates for photon creation without electric charge.... But are they radiation of photons or particles? $\endgroup$
    – Leos Ondra
    Commented Dec 6, 2016 at 18:04
  • $\begingroup$ @DavidElm Your final note is not quite correct. For example, the Standard Model neutrino spends part of its time as an electron-$W$ loop, from which it acquires a small magnetic moment. $\endgroup$
    – rob
    Commented Dec 7, 2016 at 3:12
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    $\begingroup$ It looks like it's possible that neutrinos have a magnetic moment, but this doesn't seemed to have been verified. en.wikipedia.org/wiki/Neutrino#Properties_and_reactions $\endgroup$
    – David Elm
    Commented Dec 7, 2016 at 7:46