I'm curious about virtual particle whether do they really exists, therefore I dug out an experimental theory called lamb shift by measuring the difference between the two energy levels of a hydrogen atom since the virtual particle only interact with one of the state. Can explain how the virtual particle contributes to the lamb shift effect?
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1AFAIK there is no experiment which can't be explained without virtual particles, so it's not so clear whether they exist or not. – jinawee Apr 16 '15 at 05:10
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1It's not an exact duplicate, but you might be interested to read The virtual particles are only a fictive tool in equations? DO they exist or DON'T? And if they exist, why do we call them VIRTUAL? – John Rennie Apr 16 '15 at 05:29
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I came across an interesting article see http://profmattstrassler.com/articles-and-posts/particle-physics-basics/virtual-particles-what-are-they/ – user6760 Apr 16 '15 at 09:23
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"Virtual particle" is a name given to lines in Feynman diagrams. To say that they "exist" or not is a meaningless thing to say. – ACuriousMind Apr 16 '15 at 09:41
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My answer here might give some leads http://physics.stackexchange.com/questions/147035/do-virtual-photons-have-a-frequency/147045#147045 – anna v Apr 16 '15 at 10:24