Antimatter colliding with matter

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    Antimatter Matter
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Discussion Overview

The discussion revolves around the phenomenon of antimatter colliding with matter, specifically focusing on the annihilation process and the implications of such interactions in terms of energy transformation and the nature of time. Participants explore theoretical perspectives and interpretations related to these collisions.

Discussion Character

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

Main Points Raised

  • One participant suggests that antimatter is matter traveling backwards in time, proposing that collisions cause the particles to "stop in the 4th dimension," leading to the illusion of disappearance.
  • Another participant clarifies that when matter and antimatter annihilate, they do not vanish but convert into energy, typically in the form of photons.
  • A question is raised about the number of photons produced during annihilation, with a specific mention of two photons in the case of positron-electron annihilation.
  • It is noted that "stopping in time" does not equate to disappearing, as the particles are converted into photons, which do not experience proper time.
  • A participant introduces the concept of single-photon annihilation in the presence of a high Z nucleus, referencing a specific study on the topic.
  • Discussion includes the idea that the concept of 'age' is meaningless for photons, as they travel along paths of zero proper time, leading to a debate about how time is perceived from different frames of reference.

Areas of Agreement / Disagreement

Participants express differing views on the nature of annihilation and the implications of time in these processes. No consensus is reached regarding the interpretations of time and the characteristics of photons.

Contextual Notes

There are limitations in the assumptions made about the nature of time and the behavior of particles during annihilation. The discussion reflects varying interpretations of theoretical concepts without resolving the underlying complexities.

Who May Find This Useful

This discussion may be of interest to those exploring theoretical physics, particularly in the areas of particle physics, quantum mechanics, and the philosophical implications of time and energy transformations.

BMW
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I read somewhere that if a particle of antimatter collides with a particle of matter, they annihilate each other.

Maybe this is because of what is happening in the 4th dimension(time). Since antimatter is matter traveling backwards in time, maybe the two particles stop in the 4th dimension when they collide, causing them to stand still in time, giving the illusion that they disappear...
 
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Welcome to PF;
When matter and antimatter annihilate, they do not just vanish. Their energy continues as a photon.
It is usually a good idea to find out what others have done in a field before proposing personal theories.
 
2 photons??
 
In the case of positron -electron annihilation yes two photons.
 
BMW said:
maybe the two particles stop in the 4th dimension when they collide, causing them to stand still in time, giving the illusion that they disappear...
"Stopping in time" doesn't mean to disappear. They are converted to photons which do not experience proper time (do not age)
 
Single-photon annihilation of a positron is possible in the presence of a high Z nucleus.
Sodickson, L.; W. Bowman, J. Stephenson (1961). "Single-Quantum Annihilation of Positrons". http://prola.aps.org/abstract/PR/v124/i6/p1851_1.

The "agelessness" of photons is a frequent topic in these forums - i.e.
Do Photons Age
...'age' is sort of a meaningless concept for a photon. If you mean does time pass for a photon, the answer is that photons travel along paths of zero proper time in spacetime, so the answer is no. On the other hand, if you mean if we could somehow watch a photon traveling (from a frame that *wasn't* traveling at the speed of light) would time pass for *us* whilst we watch the photon, the answer is obviously yes. So we could arbitrarily assign an 'age' to the photon from our frame, say, it's time begins when it is emitted from the atom, and ends when it is absorbed by one. The problems are firstly that the age would be frame dependent (this is the whole idea behind proper time in the first place) and secondly we can't actually 'see' or observe a photon until it's been absorbed - it's path before measurement has no real meaning as far as we can make predictions about it. Therefore there is no process by which a photon could even be *given* an age, as far as I am aware. Meaningless concept.
-- Kane O'Donnell
 

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