Why do the laws of quantum governing sub-atomic particles help in explaining
the structure of the baby universe?
It is amazing that the laws of quantum mechanics that rules the sub-atomic world should
end up being the key to the origin of the Universe. The "reason" is that in the early
Universe the energy and density of the primordial stuff was so great that both quantum
mechanics and relativity are needed to develop any reasonable explanation for the
observed phenomena. Newton's classical picture simply does not explain what is observed.