Go Back   Physics Help Forum > Physics Forums > Physics

Physics Physics Forum - General Physics Discussion and Physics News

Like Tree6Likes
Reply
 
LinkBack Thread Tools Display Modes
Old Aug 4th 2017, 03:32 AM   #11
Pmb
Physics Team
 
Join Date: Apr 2009
Location: Boston's North Shore
Posts: 992
Originally Posted by topsquark View Post
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.
Pmb is offline   Reply With Quote
Old Aug 4th 2017, 11:02 AM   #12
Junior Member
 
Join Date: Jul 2017
Posts: 4
Originally Posted by Pmb View Post
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.
Polemos is offline   Reply With Quote
Old Aug 6th 2017, 06:50 AM   #13
Pmb
Physics Team
 
Join Date: Apr 2009
Location: Boston's North Shore
Posts: 992
Originally Posted by HallsofIvy View Post
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.
Pmb is offline   Reply With Quote
Reply

  Physics Help Forum > Physics Forums > Physics

Tags
photon, photon travel



Thread Tools
Display Modes


Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
What is a photon? Anonymous General Physics 8 Jul 23rd 2017 06:53 AM
Time and Photon Fox333 Philosophy of Physics 7 May 11th 2017 01:31 AM
Photon Parvez Quantum Physics 21 May 22nd 2012 08:38 AM
photon flux newer Nuclear and Particle Physics 1 May 5th 2010 12:31 PM
phase of photon Parvez Kinematics and Dynamics 1 Mar 3rd 2009 03:01 AM


Facebook Twitter Google+ RSS Feed