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Its been a while, but here goes...It all stems from the Hysenburg uncertainty principal. Basically this is a quantum physics law that deals with measuring stuff really really accurately. The form that's useful here says ΔEΔt ≥ plank's constant (i.e. the-uncertainty-of-our-energy-measurement times the-uncertainty-of-our-time-measurement is greater than a very small number). This means there is a limit to how accurately we can measure these two things together for a particle. The point is there is room for a bit of energy (ΔE, i.e. a particle) to be created from nothing AS LONG as it goes back to being nothing before its time (Δt) is up - if its around too long then ΔEΔt ≥ plank's constant, we can measure it and its no longer a virtual particle but a real one!This is the basis for loads of stuff - for instance electron of like charge that come too close together repel each other by the exchange of virtual photons.I'm sure someone will smack me down for not getting it quite right but that's the basics i think
I think it's important to avoid trying to be too literal in ones view of these things. As I have frequently pointed out. There is no answer to the question "What is it really?"The best we can do is to describe things in terms of their behaviour.You can get somewhere if you say something behaves 'as if it were a particle'. You just can't say it IS a particle. That allows you to say that the same thing, at other times, can behave 'as if it were a wave' or 'as if it were a force'. Unfortunately, such a liberal view takes the wind out of the sails of many contributors who want a definitive answer and who rant about things from a position of ignorance rather than getting better informed.
what do you mean "The point is there is room for a bit of energy (ΔE, i.e. a particle) to be created from nothing AS LONG as it goes back to being nothing before its time (Δt) is up"?
1.Quantum theory says that “ virtual particles “ can exist in Vacuum.QT says that from these “ virtual particles “ the real particlescan be born. It is very pity, but physicists don’t explain thatparameters these “virtual particles“ have and how they become real.
Nobody knows where the electron hides its “virtual photon”.Nobody knows what “virtual photon” is.