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Sounds plausible. The constant speed of light postulated by SR assumes space is a vacuum, but quantum theory says that it isn't. We know that light traveling in a non-vacuum (through matter, for example) travels at an effective speed of slower than its vacuum speed due to interaction with the matter. It seems plausible that light interacting with virtual particles in a vacuum might be slightly slowed down due to those interactions. Plausible doesn't necessarily mean it's true, though, especially since we don't really know much about the quantum nature of space-time itself.
That depends on views. The one we can measure is 'c'. The one you seem to refer too JP, is more of a theoretical point of view, not proven by any experiments I know of? Light is at 'c', if one want it differently, give me the experiment to prove it by.
And using 'c' it's the interactions with 'densities', as matter, that 'steals time,' as I see it. Not lights speed in a vacuum.
'virtual particles' ?Indeterminacy is more to my taste. And discussing any 'speed' you need to make it measurable. In what way will you prove that 'virtual speed'?
I think that virtual particles have been made in a lab, so they are considered to be factual. I don't have a problem with them.. I use them.
Someone is skeptical about that reserch on the speed of light:http://motls.blogspot.it/2013/03/speed-of-light-is-variable-only-in-junk.htmlI haven't read the original work, however, so I can't judge.