Some more interesting food for thought: >The classical big bang cosmological models describe gravitation by Einstein’s general theory of relativity. These mode

Some more interesting food for thought: >The classical big bang cosmological models describe gravitation by Einstein’s general theory of relativity. These models are able to treat the matter content of the universe quantum mechanically where appropriate, but they do not take into account the interplay of quantum theory and gravity.... The earliest universe was presumably quantum mechanical through and through, and we can no longer describe its initial conditions in a classical language. We must instead treat the whole early universe as a quantum system and formulate its initial conditions in the language of quantum mechanics.... Quantum gravity theorists have not shied away from the challenge. At present there are some half a dozen contenders...." https://www.einstein-online.info/en/spotlight/quantum_cosmo_path_integrals/ https://www.einstein-online.info/en/spotlight/quantum_cosmo_...