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There are 20 physical constants in the Standard Model and General Relativity we cannot explain from first principles, we only know their values from experimental observation. Presumably, these constants could have taken on any range of values, rendering the universe, energy, and matter completely different from our experience and possibly rendering the universe inhospitable to life.
According to Don Lincoln of Fermi Lab, the universe at the time of the big bang may have started in a state of quantum superposition, where all states were possible all at once. When the quantum wave function collapsed, the present configuration of the physical constants were selected.
Carroll has a B.S. in Astronomy, Astrophysics and philosophy from Villanova University
https://en.wikipedia.org/wiki/Sean_M._Carroll
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