[pinballed (OP)]

Hey,
red in a book (forgot which one) that they exist, that they can even be measured in giving an electron slightly more energy than i has by it self.
Now reading "the theory about almost everything", and they mean that the virtual photon is a "handy concept" but apart from this no one knows
if they exist....

Can anybody enlighten me?

Thanks Magnus

[lightarrow]

They are not real, but everything goes "as if" they existed. Essentially they are a useful mathematical instrument, but nothing else than this, infact the same problem could be solved without making use of them and gives the same results.

[pinballed (OP)]

Thanks for a prompt answer!