The question is in the title. When we consider Feynman-diagrams (e. g. $e^{+}e^{-} \rightarrow\mu^{+}\mu^{-}$), we often have virtual photons. Do these travel with the speed of light?
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Does this answer your question? Are virtual particles limited by the speed of light? – Nihar Karve Jan 07 '21 at 12:59
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Another possible duplicate: https://physics.stackexchange.com/q/117013 – Nihar Karve Jan 07 '21 at 13:01