What is the meaning of a collinear photon in Quantum Electrodynamics (QED)?

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Discussion Overview

The discussion revolves around the concept of a "collinear photon" in Quantum Electrodynamics (QED), particularly focusing on its definition and implications in contexts such as stimulated emission and scattering angles at high energy. Participants seek clarification on the terminology and its significance within the framework of QED.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant requests clarification on the meaning of a "collinear photon" and its relevance in QED.
  • Another participant suggests that in the context of stimulated emission, collinear photons are those that travel in the same direction as the stimulating photon, reinforcing each other.
  • A participant mentions the relationship of photons to the momentum components p^{+}, p^{-}, and p_{\bot}, although the significance of these symbols is not defined in the discussion.
  • A later reply indicates an understanding of "collinear" in terms of scattering angles, stating that it refers to a scenario where the scattering angle of the photon is equal to pi at very high energy.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the term "collinear photon," with some proposing connections to specific contexts like stimulated emission, while others introduce additional concepts without consensus on definitions or implications.

Contextual Notes

There are unresolved definitions related to the symbols p^{+}, p^{-}, and p_{\bot}, and the discussion does not clarify the broader implications of collinear photons in QED beyond the mentioned contexts.

ndung200790
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Please teach me this:
What is collinear photon (emission)?I do not understand why call ''collinear'' photon.
Thank you very much for your kind helping.
 
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I am not sure of the the context of your question. If you are asking about stimulated emission (lasers), then the stimulated photon goes in the same direction (reinforces) the stimulating photon, so they are collinear.
 
In this case,the photons related with the p[itex]^{+}[/itex],
p[itex]^{-}[/itex] and p[itex]_{\bot}[/itex] .
 
ndung200790 said:
In this case,the photons related with the p[itex]^{+}[/itex],
p[itex]^{-}[/itex] and p[itex]_{\bot}[/itex] .

Could you define these symbols?
 
Thank you very much for your kind heart.Now I have realized the singularities because ''collinear'' photon meaning scattered angle of photon equal pi in QED at very high energy.
 

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