Particle pair creation probability

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calinvass
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I know that a high frequency light beam is more likely to generate a virtual electron-positron pair than a low frequency one. Can this probability depend on the reference frame? It seems there is a paradox. How do we explain it?
 

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Demystifier
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In quantum theory, there is no such thing as probability for creation of virtual particles. Therefore there is no paradox.
 
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