# The end of the Grand Unification Epoch

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In standard textbooks of cosmology it is sometimes mentioned that the Grand Unification Epoch ended at approximately  $t_{\small GUT}\approx 10^{−36}$s after the Big Bang. At this point, the strong force separated from the other fundamental forces. Is there a (simple) formal derivation to get this estimate?

EDIT: Maybe an answere can be found by reasoning why the grand unification energy is taken to be $10^{15}$ GeV or so.

asked May 24, 2020
edited May 24, 2020

I guess there are ones, but they really depent on the initial hypothesises.

For example, slow neutrons in the neutron waveguides are a manifestation of strong forces too, but the time and space scales are there quite different from BB conditions.

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