Understanding Virtual Particles: The Mystery of Annihilation and Energy

Click For Summary

Discussion Overview

The discussion revolves around the concept of virtual particles, particularly focusing on their creation, annihilation, and the implications for energy conservation in a vacuum. Participants explore theoretical aspects, including the nature of virtual particles, their lifetimes, and the relationship between energy and particle-antiparticle pairs.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions what virtual particles do during their lifetime and whether they occupy the same position, raising concerns about how they can annihilate.
  • Another participant references the uncertainty principle, suggesting that the energy of virtual particles can fluctuate, allowing for their creation and annihilation within a limited timeframe.
  • A different viewpoint states that virtual particles can transfer momentum and exist everywhere due to the Heisenberg Uncertainty Principle (HUP).
  • There is a claim that when virtual particles annihilate, another virtual pair is produced, implying a continuous presence of energy in the vacuum.
  • A participant challenges the notion that the same energy is always present, suggesting it complicates the understanding of energy conservation.

Areas of Agreement / Disagreement

Participants express differing views on the implications of energy conservation related to virtual particles and their interactions. There is no consensus on whether the energy associated with virtual particles can be considered constant or how it relates to vacuum energy.

Contextual Notes

Some assumptions about the nature of virtual particles and their energy characteristics remain unresolved, and the discussion reflects varying interpretations of quantum mechanics principles.

Sterj
[SOLVED] virtual particles

If there is createn a virtual pair (anti particle A and its particle B) in vacuum what are they doing in their life time? Is A always at the same position like B or how can they annihilate? And if they annihilate, what's with the energy (does it disappear)? Has the anti particle negativ energy?

I hope you can answer this questions :smile:
 
Physics news on Phys.org
No. Due to a manifestation of the canonical commutation relations, we have

[tex]\Delta E \Delta t \ge \frac{h}{4\pi}[/tex]

which means that in an ever decreasing short amount of time, the uncertainty of the energy increases. If [itex]\Delta t[/itex] is small enough, then [itex]\Delta E[/tex] can be big enough for there to be enough energy for a particle-antiparticle pair to be created. Of course, this means that those two particles have to annihilate with each other before [itex]\Delta t[/itex] is over, or if an external source of energy is given to the vacuum to make up for the [itex]\Delta E[/itex], then the two created particles can live on. The two particles won't generally be in the same position during their lifetimes.[/itex]
 
Last edited:
Sterj said:
If there is createn a virtual pair (anti particle A and its particle B) in vacuum what are they doing in their life time? Is A always at the same position like B or how can they annihilate?

A virtual particle transfers a definite momentum p, so due to HUP it is everywhere.

And if they annihilate, what's with the energy (does it disappear)?

No, another virtual pair is produced

Has the anti particle negativ energy?

I hope you can answer this questions :smile:
Yes

i urge you to read my journal. I have written several entries on this topic. Check it out
https://www.physicsforums.com/journal.php?s=&action=view&journalid=13790&perpage=10&page=2

Look at the bottom of the page
regards
marlon
 
Last edited by a moderator:
"No, another virtual pair is produced"

That would mean, that the "same" energy is always there?
 
Sterj said:
"No, another virtual pair is produced"

That would mean, that the "same" energy is always there?

Ofcourse, that is the vacuum energy. It is because this energy is non-zero that them vacuum fluctuations and virtual particles exist in the first place

I am sure i have told this before...

marlon
 
But if the same energy is alway there, it takes the energy "sentense" in danger (E1=E2).
 

Similar threads

  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 12 ·
Replies
12
Views
6K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 14 ·
Replies
14
Views
5K
  • · Replies 21 ·
Replies
21
Views
5K
  • · Replies 4 ·
Replies
4
Views
4K
  • · Replies 28 ·
Replies
28
Views
4K