The birth of the universe is a quantum transformation from Euclid space to Rockwell space-time, which realizes the idea that the universe is created out of nothing. This Euclidean space is a four-dimensional sphere. In the initial stage of the transformation from four-dimensional sphere to Rockwell spacetime, spacetime is a skyrocketing stage, which can be approximately described by De Sitter metric. Then the expansion slows down and is described by the big bang model. The space in this universe model is limited, but there is no boundary, so it is called a closed universe model.

This is Hawking's quantum cosmology without boundary conditions.

Stephen william hawking, ALS patient, is a famous British physicist and cosmologist. Patients with amyotrophic lateral sclerosis are paralyzed and unable to pronounce. Hawking's main research fields are cosmology and black holes. He proved the singularity theorem and black hole area theorem of general relativity, and put forward the evaporation phenomenon of black holes and the borderless Hawking universe model, which took an important step to unify the two basic theories of physics in the 20th century-relativity founded by Einstein and quantum mechanics founded by Planck.