Initially, the Universe was a Neutron Object, a homogeneous neutron structure. This Neutron Object had a high, angular velocity of rotation. The mass of a Neutron Object is of the order of M_UV≈〖10〗^53 Kg, in the modern metric. The physical values that determine its internal structure changed when the interaction potential of the neutron energy structures changed.
The purpose of the expansion of the Universe is the decay of the Neutron nucleus of the Object of the Universe into proton-electron plasma or into hydrogen atoms. Each particle of the Universe has its own specific role. The original object of the Universe was neutron matter.