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Aug 4th 2017, 03:32 AM   #11
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 Originally Posted by topsquark If a particle is not observed it is called a "virtual" particle. -Dan
First off a virtual particle is not a particle at all but a disturbance in a field.

https://en.wikipedia.org/wiki/Virtual_particle

See: https://profmattstrassler.com/articl...what-are-they/

A particle that can't be observed and which mediates a force is called a virtual particle and such a particle doesn't necessarily remain on its mass shell. E.g. a virtual photon cannot in principle be observed and can even have nonzero rest mass.

There is a big difference between a photon and a virtual photon.

Aug 4th 2017, 11:02 AM   #12
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 Originally Posted by Pmb First off a virtual particle is not a particle at all but a disturbance in a field. https://en.wikipedia.org/wiki/Virtual_particle See: https://profmattstrassler.com/articl...what-are-they/ A particle that can't be observed and which mediates a force is called a virtual particle and such a particle doesn't necessarily remain on its mass shell. E.g. a virtual photon cannot in principle be observed and can even have nonzero rest mass. There is a big difference between a photon and a virtual photon.
A virtual particle is a wave. No need to use the word "particle" at all.

The word "virtual" is a synonym of "potential", i.e., electrical, quasi-irrotational. Thus, the so-called "virtual particles" are the electrical field, which is purely wave-like, nonlocal.

When the intensity of an electrical field's angular momentum reaches the Planck quantum of action (h), the potential or "electrical" field manifests itself as an actual or "magnetical" field, which is a "quantum" or "particle" whose energy is E=hf, where f is the frequency.

Aug 6th 2017, 06:50 AM   #13
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 Originally Posted by HallsofIvy Matter can't move faster than the speed of light. There is no such limit on the expansion of space.
HOI is assuming that tachyon's cannot exist and that virtual particles can't move FTL, but they're just a mathematical gimmick anyway as I'm told.

 Tags photon, photon travel

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