<p>In the Inflation theory, it said that the Inflationary epoch has happened <span class="math-container">$10^{-32} \,\mathrm{s}$</span> 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.</p>

CC BY-SA 4.0
2020-12-02T04:25:46.810Z
Have you checked the original paper?  By Alan Guth I think.  it may be explained there. The paper is here.  https://journals.aps.org/prd/pdf/10.1103/PhysRevD.23.347
Natsfan
CC BY-SA 4.0
2020-12-02T07:34:09.900Z
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.
Steve Linton
<big-bang-theory><cosmological-inflation>
Accuracy of the Inflation theory
Jack the Ranger
# Accuracy of the Inflation theory

(Asked by: username_0 on 2020-12-01)

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.

**Tags:** big-bang-theory, cosmological-inflation
> **Comments:**
> **username_1**: Have you checked the original paper?  By Alan Guth I think.  it may be explained there. The paper is here.  https://journals.aps.org/prd/pdf/10.1103/PhysRevD.23.347  
> **username_2**: 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.  

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