Quantum Field Theory: What if Photon Made from Multiple Particles?

In summary, the conversation discusses the concept of representing a spin 1 field, like the photon, as the combination of two spin 1/2 fields. This idea has been proposed by various physicists, including Schwinger, but has not been well-constructed enough for it to be taken seriously by other physicists. The conversation also mentions theories in which the photon is treated as two fermions, but there is no clear understanding of how the MS=0 state is suppressed in these theories. Ultimately, it is noted that while physics is open to new and wild ideas, they must be backed up by evidence and observations.
  • #1
kurious
641
0
If a photon was made from more than one particle, how would quantum field theory be modified?
 
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  • #2
A spin 1 field, like the photon's, can be represented as the combination of two spin 1/2 fields. This is an idea that IIRC goes back to Schwinger. It's just math, because the spin 1/2 fields are not observed, and don't have any collective effects that are observed either. Note the difference from quarks, which are not observed but whose collective effects can be calculated and matched to experimental results.

Various people have put forward theories with these unobservable fermions generating the photons, but I have yet to see one that is well enough constructed in detail for other physicists to take it seriously.

Contrary to what you often hear, physics is not averse to wild and crazy ideas per se. But it does require that creators do their homework and link their theories to observation. All the fantastic level of detail observation that 100 years of experiment have given us, and which ordinary quantum mechanics does link to successfully. Just shouting over and over that my theory is important and the wicked old scientists are suppressing it won't work.
 
  • #3
selfAdjoint said:
A spin 1 field, like the photon's, can be represented as the combination of two spin 1/2 fields. This is an idea that IIRC goes back to Schwinger. It's just math, because the spin 1/2 fields are not observed, and don't have any collective effects that are observed either.
a photon is represented as two fermions? what the... can you provide a reference for this? every treatment of QED i have ever seen treated the photon field as a vector potential, satisfying commutation relations (not anticommutation). I have never seen this done, but I have read that some people have also tried quantizing the field strength itself, instead of the vector potential, but either way, it is still a bosonic field.

i am not saying you are wrong, nor trying to get into an argument with you, but i am just saying that I have never heard of what you are saying, and would like you to back it up with some references.

selfAdjoint: please provide a reference that shows the photon field being represented as two fermionic fields!
 
  • #4
I've never read any theory that treats the photon as two fermions, but does not sound all that far fetched. Consider a BEC formed by rubidium atoms for an example of a collection of fermion fields that obeys Bose-Einstein statistics.
 
  • #5
SelfAdjoint:

In these theories in which the photon is treated as two fermions, how is the MS=0 state suppressed, so that the eigenvalues of Jz are restricted to ±1? A would-be theorist (p_mintz) posted his idea for treating the photon as 2 fermions over a year ago and I asked him the same question, but he had no answer for me. :frown:

edit: fixed a typo
 
  • #6
Tom, I haven't a clue. I haven't studied any of these theories deeply.
 
  • #7
selfAdjoint said:
Tom, I haven't a clue. I haven't studied any of these theories deeply.
selfAdjoint: can you provide a reference, a source, a name, for a theory that treats the photon as two fermions?
 
  • #8
Well the one I can't stand is from our occasional poster dr Ameen. And Tom just mentioned another one. Hey, I never said they were reasonable!
 
  • #9
selfAdjoint said:
Well the one I can't stand is from our occasional poster dr Ameen. And Tom just mentioned another one. Hey, I never said they were reasonable!
were you referring to crackpot theories?
 
  • #10
How is the M spin = 0 state suppressed?
A good point.I'll let you know when my theory can explain it!
This is the crux of the matter.
 

1. What is quantum field theory?

Quantum field theory is a theoretical framework that combines quantum mechanics and special relativity to describe the behavior of particles at the subatomic level.

2. How is a photon made from multiple particles?

In quantum field theory, a photon is described as a quantized excitation of the electromagnetic field. This means that it is made up of multiple particles, specifically virtual particles called "virtual photons."

3. How does this concept affect our understanding of light?

The concept of a photon being made from multiple particles does not significantly change our understanding of light. It is simply a different way of describing the behavior of light at the subatomic level.

4. Are there any experiments or evidence to support this theory?

Yes, there have been multiple experiments and observations that support the idea of a photon being made from multiple particles. For example, the phenomenon of light scattering can be explained using the concept of virtual photons.

5. How does this relate to other theories in physics?

Quantum field theory is a fundamental theory that is used to describe the behavior of particles and fields in many other branches of physics, such as particle physics and cosmology. The concept of a photon being made from multiple particles is just one aspect of this larger framework.

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