How does one fermion change the energy of another fermion

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Discussion Overview

The discussion centers on how one fermion influences the energy of another fermion, exploring concepts related to particle interactions, energy transfer, and the role of bosons in these processes. The scope includes theoretical considerations and conceptual clarifications regarding particle physics.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant suggests that when fermion x approaches fermion y, x emits bosons that are absorbed by y, leading to energy transfer.
  • Another participant challenges this view, describing the idea of bosons as a "myth" and suggesting that the interactions can be explained without invoking boson emission.
  • This participant also emphasizes that momentum, rather than energy, is primarily affected during interactions between fermions.
  • A subsequent post questions how a fermion's energy changes, mentioning kinetic energy changes due to electric fields and energy increases in atomic orbitals through photon absorption.

Areas of Agreement / Disagreement

Participants express differing views on the mechanism of energy transfer between fermions, with no consensus reached on the role of bosons or the nature of the interactions involved.

Contextual Notes

There are unresolved assumptions regarding the nature of particle interactions, the definitions of energy and momentum in this context, and the implications of the Pauli Exclusion Principle on energy transfer.

susskind99
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My understanding of how one fermion changes the energy of another is something like: fermion x approaches fermion y and x emits bosons which are absorbed by y. But why does one billiard ball transfer a lot of its energy to another billiard ball on contact? Say billiard ball x approaches billiard ball y, x hits y, x stops and y moves. I realize the Pauli Exclusion Principle forbids x from occupying the same place as y. But why does y absorb more bosons from x than vice versa? Why would the fact that x is moving y to absorb more bosons from x than x absorbs from y?
 
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hi susskind99! :smile:
susskind99 said:
My understanding of how one fermion changes the energy of another is something like: fermion x approaches fermion y and x emits bosons which are absorbed by y.

sorry, but that's just a myth told by mathematicians to frighten physicists! o:)

those boson lines you see in feynman diagrams "carrying the force" are just a mathematical trick that help in the calculations

after all, when two electrons repel each other, do you think that can be explained by by emitting (presumably negative-mass) bosons? :wink:

(and btw, it's really the momentum that's affected, rather than the energy)
 
tiny-tim said:
hi susskind99! :smile:


sorry, but that's just a myth told by mathematicians to frighten physicists! o:)

those boson lines you see in feynman diagrams "carrying the force" are just a mathematical trick that help in the calculations

after all, when two electrons repel each other, do you think that can be explained by by emitting (presumably negative-mass) bosons? :wink:

(and btw, it's really the momentum that's affected, rather than the energy)



Then how does a fermion's energy change?
 
susskind99 said:
Then how does a fermion's energy change?

Like kinetic energy? You can accelerate a charged fermion via electric field.

Or you mean increase of electron energy in atomic orbital? Electron absorbs a real photon.
 

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