Does Photons bouce off eachother

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Discussion Overview

The discussion centers around the question of whether photons can bounce off each other, particularly in the context of laser beams and the implications for the double-slit experiment. Participants explore the theoretical aspects of photon interactions, including quantum electrodynamics (QED), and how these interactions might affect observed phenomena.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants propose that if photons can bounce off each other, it could explain the behavior observed in the double-slit experiment, suggesting that photons might deflect in various directions upon interaction.
  • Others argue that while QED predicts photon interactions, these interactions are extremely weak and have not been observed, indicating that they cannot account for the interference patterns seen in the double-slit experiment.
  • One participant questions whether a photon bouncing off another would count as detection, suggesting that such interactions could affect the wave-like properties of photons and the resulting interference pattern.
  • Another participant seeks clarification on the term QED, indicating a gap in understanding that may affect the discussion's depth.

Areas of Agreement / Disagreement

Participants express differing views on the significance and implications of photon interactions, with no consensus reached regarding whether photons can effectively bounce off each other or how this might relate to the double-slit experiment.

Contextual Notes

There is a lack of consensus on the nature and implications of photon interactions, particularly regarding their effects on interference patterns and the theoretical framework of QED. Some assumptions about the strength and observability of these interactions remain unresolved.

bassplayer142
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Does a photon bounce off another photon. Say you had hundreds of watts of laser photons shooting in one direction. Then in the other direction a few stray photons. Will they get deflected off to the side or backwards? If so, then it would explain why the double slit experiment would work. That the photons are constantly bumping into each other and going separate ways. That is unless they are not deflected in the up and down axis though.
 
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bassplayer142 said:
Does a photon bounce off another photon. Say you had hundreds of watts of laser photons shooting in one direction. Then in the other direction a few stray photons. Will they get deflected off to the side or backwards? If so, then it would explain why the double slit experiment would work. That the photons are constantly bumping into each other and going separate ways. That is unless they are not deflected in the up and down axis though.

The interaction of visible spectrum photons is predicted in QED. However, it is a very weak 4-th order effect, which has not been observed yet, as far as I know. Even if this interaction was strong, it could not be used to explain the double-slit experiment, because the interference pattern exists even when photons are released one-by-one, and do not have a chance to interact with each other.

Eugene.
 
Ok, so I've tried several times already, but can't seem to figure out what QED stands for. I'd guess the Q is quantum, but that's as far as I get. Can someone help me please? Thanks.

Besides that the double-slit works with individual photons at a time, I don't see how this collision effect could play a large role. It simply doesn't seem to create or imply an interference pattern (wave interference), at least as far as I can see.

A possibly interesting point is this then: a photon bouncing off another should count as detection, right? So if the photons were hitting a lot, wouldn't they seemingly lose their wave-like properties, and thus not form as strong an interference pattern if many photons were shot simultaneously?
 
ganstaman said:
Ok, so I've tried several times already, but can't seem to figure out what QED stands for. I'd guess the Q is quantum, but that's as far as I get. Can someone help me please? Thanks.

QED = quantum electrodynamics

Eugene.
 
ganstaman said:
Ok, so I've tried several times already, but can't seem to figure out what QED stands for. I'd guess the Q is quantum, but that's as far as I get. Can someone help me please? Thanks.

I select the word in the text, right-click, and choose "Search Dictionary for QED..." and that opens this page in another tab.

Very handy for all my reading! Paper just cannot compare.
 

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