Emmy Noether defined the conditions under which energy-momentum conservation can be proven within a reference frame. Einstein’s Relativity is in some respects in conflict with these conditions. The repair for Noether’s laws is minor and leads to many simplifications:
Natural coordinates lead to the space-time and the mass-energy of our universe and also lead to the smallest quanta of space, time, (angular) momentum, and mass-energy based on Bohr’s uncertainty principle and Fredkin’s finite nature hypothesis. Planck units get a new meaning.
Repairing Einstein’s Relativity for Noether’s Energy-momentum Conservation