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There is lots of evidence for photons in the EM field, beginning with Planck's invention of photons. http://hermes.ffn.ub.es/luisnavarro/nuevo_maletin/Planck%20

There is lots of evidence for photons in the EM field, beginning with Planck's invention of photons. http://hermes.ffn.ub.es/luisnavarro/nuevo_maletin/Planck%20(1900),%20Distribution%20Law.pdf http://hermes.ffn.ub.es/luisnavarro/nuevo_maletin/Planck%20(... If you make the energy in a mode of the EM field continuous, you get the famous 'ultraviolet catastrophe.' This holds whether the matter involved has a continuous emission spectrum or not.

renox 4y ago
I'm not so sure: 'black body' are made of atoms, atoms emits lights only on certain frequency due to the way electrons orbitals are structured, with discrete energy levels, but I don't see how this is related to EM fields themselves..
- wyager 4y ago
  Free electrons also emit blackbody radiation. Photon quantization has nothing to do with the energy levels of atoms. It is a very fundamental property of the universe - you can tell because the only relevant constant is planck's constant.
  - renox 4y ago
    I didn't say that light isn't quantized, I just said that for me blackbody radiation of ordinary matter isn't a convincing proof that light is quantized.. As for free electrons emitting blackbody radiations can you give me a reference? If you're talking about a wiggle (https://en.wikipedia.org/wiki/Wiggler_(synchrotron) https://en.wikipedia.org/wiki/Wiggler_(synchrotron)) I don't see how this is related to the issue.
    - oh_my_goodness 4y ago
      The sun is full of free charged particles.
    - wyager 4y ago
      So there are two things we should identify separately that go under the name "quantization". One is that when we send out a single photon worth of energy, even in an isotropic or other multi-path emission pattern, we only ever seem to detect a single photon. You can prove this with a half mirror and two detectors. This is kind of weird - not clear how this works, and the core question driving different quantum interpretations. Second is that the energy level of a single photon detection is based on the constraint that Et=h (t is period), also written E=hf. This is not related to atomic properties of the detector. Why? Equation does not depend on any variable of the detector. Same goes for Px=h. (Momentum/wavelength relationship.) You can prove that one with two razor blades close together. Same relationship, but along space axes instead of time. Also for uncertainty principle - reinterpret EPtx as the variance of their distributions. All of this is some sort of fundamental constraint of the universe around quantities of dimension force*time*distance (action). Not related to atoms per se. Not that I understand why this constraint exists. I know some ways to think about it mathematically, but not intuitively.

renox 4y ago

I'm not so sure: 'black body' are made of atoms, atoms emits lights only on certain frequency due to the way electrons orbitals are structured, with discrete energy levels, but I don't see how this is related to EM fields themselves..

wyager 4y ago
Free electrons also emit blackbody radiation. Photon quantization has nothing to do with the energy levels of atoms. It is a very fundamental property of the universe - you can tell because the only relevant constant is planck's constant.
- renox 4y ago
  I didn't say that light isn't quantized, I just said that for me blackbody radiation of ordinary matter isn't a convincing proof that light is quantized.. As for free electrons emitting blackbody radiations can you give me a reference? If you're talking about a wiggle (https://en.wikipedia.org/wiki/Wiggler_(synchrotron) https://en.wikipedia.org/wiki/Wiggler_(synchrotron)) I don't see how this is related to the issue.
  - oh_my_goodness 4y ago
    The sun is full of free charged particles.
  - wyager 4y ago
    So there are two things we should identify separately that go under the name "quantization". One is that when we send out a single photon worth of energy, even in an isotropic or other multi-path emission pattern, we only ever seem to detect a single photon. You can prove this with a half mirror and two detectors. This is kind of weird - not clear how this works, and the core question driving different quantum interpretations. Second is that the energy level of a single photon detection is based on the constraint that Et=h (t is period), also written E=hf. This is not related to atomic properties of the detector. Why? Equation does not depend on any variable of the detector. Same goes for Px=h. (Momentum/wavelength relationship.) You can prove that one with two razor blades close together. Same relationship, but along space axes instead of time. Also for uncertainty principle - reinterpret EPtx as the variance of their distributions. All of this is some sort of fundamental constraint of the universe around quantities of dimension force*time*distance (action). Not related to atoms per se. Not that I understand why this constraint exists. I know some ways to think about it mathematically, but not intuitively.