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Is it even possible for a virtual particle-antiparticle pair to be torn apart by cosmological expansion? Virtual particle-antiparticle pairs are ripped apart near black hole event horizons, creating Hawking Radiation, but can this ever be reproduced by the expansion of space due to a cosmological constant? And if so, at what rate of expansion would this occur? Would the rate have to equal c?

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    $\begingroup$ Yes it's possible. There is a whole literature on it. The temperature of the radiation is related to the "surface gravity" of the cosmological horizon in the same way the Hawking temperature is related to the surface gravity of a black hole. $\endgroup$ – Michael Brown Jul 8 '13 at 10:34
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    $\begingroup$ Indeed, according to old Jedi wisdom "GR leads to curvature, curvature leads to non unique vacua, and non unique vacua lead to the not-totally-dark side." $\endgroup$ – twistor59 Jul 8 '13 at 10:55
  • $\begingroup$ Ha ha @twistor59 LOL :-D. Are you interested in helping to reopen some good questions, that already have 4 votes? $\endgroup$ – Dilaton Jul 8 '13 at 12:27

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