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How at the beginning of this universe the fields as proposed in quantum fields theory get excited?? How exactly these fields originated?

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    $\begingroup$ This sounds like a physics question more than Astronomy, and I'm not sure it's an answerable physics question either. $\endgroup$
    – userLTK
    Aug 6 '18 at 9:12
  • $\begingroup$ Because it was possible? This could even become a metaphysical question... $\endgroup$
    – J. Chomel
    Aug 6 '18 at 12:30
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Unfortunately, this question is one which is under active -- and so far fruitless -- investigation by the theoretical physics community. Anyone who could answer it would have the choice of publishing here and getting +450 reputation or so, and a couple of badges. Or they could publish in Nature of Phys Rev and get at least one Nobel Prize.

Bottom line: No one knows yet.

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