Would it be possible to create EM radiation, starting this process without photon emission from subatomic particles?

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    $\begingroup$ How could anything to do with light propagation be explained without photons? $\endgroup$ – Bill Alsept Dec 27 '17 at 21:09

Classical electromagnetic waves and quantum field theoretical photons describe the same phenomena—indeed, photons are modes of the field.

There is no distinction between "EM radiation" and "photon emission" except for how you frame the description.

So the answer is "No."

  • $\begingroup$ There's no way to generate photons by simply accelerating charges? I guess the point is that to accelerate a charge you have to create a potential that the particle is pushed by, and then photon radiation is due to the atom decreasing its now-increased energy. $\endgroup$ – Steven Sagona Dec 27 '17 at 23:13
  • $\begingroup$ @StevenSagona it still involves a photon. $\endgroup$ – Bill Alsept Dec 27 '17 at 23:53
  • $\begingroup$ Photons are excitations of the corresponding modes, but yes. $\endgroup$ – Emilio Pisanty Dec 28 '17 at 0:16
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    $\begingroup$ @EmilioPisanty A photon, as in a localized quantum of energy and separate from other photons. What are corresponding modes and what about them gets excited? How do you know they’re excited? $\endgroup$ – Bill Alsept Dec 28 '17 at 0:34

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