Linked Questions

10
votes
3answers
1k views

Heisenberg energy uncertainty [duplicate]

I am biologist and just new to the field of quantum mechanics and trying to understand the subject by reading. It is said that virtual particles are created due to the uncertainty of energy when ...
10
votes
2answers
2k views

Uncertainty principle in quantum field theory

Can the uncertainty principle be derived in quantum field theory? If yes, does is have a different interpretation than quantum mechanics because the coordinates $x_i$ are now parameters and not ...
8
votes
1answer
4k views

Confusion in understanding of quantum fluctuations and vacuum energy [duplicate]

I'm having a bit of trouble understanding what exactly is meant by a quantum fluctuation of a quantum field and its relation to the vacuum energy attributed to such a field. Is the point, that due ...
4
votes
3answers
2k views

How Uncertainty Principle, Vacuum fluctuations and Energy Conservation coexist in QFT?

Recently I had a debate about the uncertainty principle in QFT that made me even more confused.. Because we use Fourier transforms in QFT, we should have an analogue to the usual Heisenberg ...
1
vote
1answer
373 views

Virtual Photon in Electron Scattering Feynman diagram [duplicate]

If we know that the virtual photon emitted in an electron scattering Feynman diagram violates the energy and momentum conservation laws (though temporarily), why do we accept it as a feasible diagram ...
1
vote
1answer
458 views

Do virtual particles pop in and out of existence in the space just outside the nucleus? [duplicate]

This question is similar to one asked if virtual electrons exist outside the nucleus, but please note, my question says virtual particles. It is not a duplicate. I read so often that matter is mostly ...
2
votes
0answers
510 views

Understanding QED vacuum polarization

QED makes predictions about the polarization density of the vacuum based on the presence of virtual e-p pairs, which has a screening effect on the bare charge of the electron (which is infinite). My ...
0
votes
2answers
215 views

Do the virtual particles have any mathematical meaning in vacuum in absense of real quanta? [duplicate]

I have edited this question with its title. Virtual particles, as I understand, arise as intermediaries in the calculations describing interactions such as scattering between real particles and in ...
0
votes
1answer
127 views

What does following animation represent for vacuum (quantum) fluctuation?

On the page of quantum fluctuation, we have a gif representing some kind of fluctuation and according to AFT answer here $H$ which is $P^{0}$ and $P^{0}|vac\rangle=0$ which would imply $\langle vac|H^...
2
votes
1answer
185 views

Is the QFT vacuum $T$-invariant?

A quantum vacuum corresponds to closed loops of particle-antiparticle pairs, in the language of Feynman diagrams. There is no relation between $E$ and $p$ for these particles, i.e., they are not on ...
2
votes
1answer
103 views

Sounds in Space, vibration of virtual particles

Sound is only available to travel through a transmission medium. My question is due to space not truly being empty, more specifically there are virtual particles in a vacuum, can sound be propagated ...
0
votes
0answers
171 views

Proof for fluctuations in vacuum

I'm not a physicist. My understanding of Heisenberg's uncertainty principle and its proof (that is given by an imaginary microscope) is that for example: at a specified time determining the exact ...