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Jun 21, 2020 at 15:46 comment added JBH @TonDay Thanks for the link! I was unaware of their use in physics. However, even that article explains that virtual particles are not "definitely a real thing." What they are is definitely a useful mathematical construct to help physicists explore the interaction of real (actual, existing) particles. In other words, physicists are using definition #4.
Jun 21, 2020 at 11:32 comment added Ton Day Virtual particles are definitely a real thing: en.wikipedia.org/wiki/Virtual_particle
Jun 21, 2020 at 3:53 history answered JBH CC BY-SA 4.0