What is the approximate time frame during which the uniformity of the cosmos was established by the inflationary stretch?
Answer
Within the first $10^{-32}$ seconds.
The duration of the exponential stretch, which set the stage for temperature uniformity across the universe, is dictated to have occurred within the first $10^{-32}$ seconds or so following the Big Bang.
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Cosmic Inflation Explained | Cosmology 101 Episode 6 - YouTube
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