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In the Inflation theory, it said that the Inflationary epoch has happened $10^{-32} \,\mathrm{s}$ after the Big Bang, and I cannot find anything related to how this number was calculated and how accurate was it. Thank you in advance.

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    $\begingroup$ Have you checked the original paper? By Alan Guth I think. it may be explained there. The paper is here. journals.aps.org/prd/pdf/10.1103/PhysRevD.23.347 $\endgroup$
    – Natsfan
    Commented Dec 2, 2020 at 4:25
  • $\begingroup$ Un sourced vegue understanding, hence comment not answer: at the end of inflation, the decay of the inflaton field produced a lot of other particle and radiation which filled space. The density and termperature of these can be estimated from basic physics. Tracking backwards we can estimate when the universe was that hot and dense. $\endgroup$ Commented Dec 2, 2020 at 7:34
  • $\begingroup$ @jmh Thank you. That was helpful. $\endgroup$ Commented Dec 3, 2020 at 5:02

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