What happens to virtual photons when an EMF is extinguished?

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Discussion Overview

The discussion centers on the fate of virtual photons when the electromagnetic fields of a contrawound toroidal coil cancel to zero. Participants explore the implications of this cancellation on virtual particles, particularly in the context of electromagnetic fields (EMF) and quantum electrodynamics.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • One participant questions what happens to virtual photons when the electromagnetic fields cancel, asking if they emit virtual particle pairs or self-annihilate.
  • Another participant asserts that virtual particles are misunderstood and provides links to resources for clarification.
  • Some participants emphasize that virtual photons are not real, suggesting that nothing happens to them because they do not exist in a measurable sense.
  • One participant acknowledges differing opinions on the reality of virtual particles but insists that there are no "informed" opinions that support their existence in this context.
  • A later reply suggests rephrasing the original question to focus on the mathematical implications of virtual photons in the given physical situation, proposing that contributions from two sets of virtual photons would cancel each other out.

Areas of Agreement / Disagreement

Participants express significant disagreement regarding the reality and implications of virtual photons. While some argue that they are not real and thus have no fate, others suggest that they serve as useful computational tools in physics.

Contextual Notes

The discussion reflects a range of interpretations about virtual particles, particularly their existence and role in quantum electrodynamics. There are unresolved assumptions regarding the definitions and implications of virtual photons in the context of electromagnetic fields.

Fluxation
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Let's say I feed the same electrical signal into the opposed windings of a contrawound toroidal coil, and that this results in their individual electromagnetic fields cancelling to "zero". Can someone explain what in turn happens to the virtual photons associated with those canceled fields? For example, do they emit virtual particle pairs, self-annihilate .. or?

Are there any disturbances intrinsic to either outcome that could be said to possesses characteristics of the original electric current? For example, a frequency or waveshape?
 
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I am aware there are differing opinions regarding the "reality" of virtual particles. This has been discused eleswhere, as has the Casimir Efect. My question related primarily to virtual photons.
 
Virtual photons are not real. The answer is the answer. You may not accept this, but it doesn't change it.
 
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Fluxation said:
I am aware there are differing opinions regarding the "reality" of virtual particles.
There are different opinions, but not different informed opinions (in this context, "informed" means "has been through a graduate-level quantum electrodynamics course" or equivalent).

Nothing happens to the virtual photons because there weren't any there in the first place.
 
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I understand virtual particles are by definition unmeasurable. But can anyone answer my original question in the context of virtual photons transmitting EMF?

[Mentor's note: This post has been edited to remove speculation not allowed under the Physics Forums rules ]
 
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Fluxation said:
But can anyone answer my original question

No, because virtual photons are not real. Nothing "happens to them" because they are not real things.
 
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Vanadium 50 said:
[...] Nothing "happens to them" because they are not real things.
Hmm. In view of the OP's response to earlier answers, I suspect the virtual photons start huddling together, whispering amongst themselves about how those silly humans are not real.

o0)
 
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I think the question asked by OP is not so meaningless. Even though the virtual photons are not real, they are a useful computation tool. So one can rephrase his question into something like - how the mathematics of virtual photons would look like in such-and-such physical situation? In his case, I would say that there would be two sets of virtual photons, the contributions (to the total force) of which would cancel each other.
 

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