Space-Time and Quantum Mechanics Implications of Discovered Cosmic Acceleration

Although cosmology is ``a branch of astronomy dealing with origin, evolution, and eventual fate of the universe,'' it is the physics frontier on atomic and laboratory scales as well. Einstein's relativity is a principal contributor to the overarching LambdaCDM model from the Big Bang to present time. Now empirical constraints and discoveries ranging from observed wide-binary/spiral galaxy rotation flattening to cosmic acceleration and the Hubble tension point to extended space-time physics encompassing (again) all scales. Here we build on derived cosmic acceleration (2019/20) and the related derivation of wide-binary/spiral galaxy rotation flattening (2017/20; setting aside ``external field effect'' for now) to show that the ``round-trip axiom'' holds in the accelerating Hubble-expansion (as it holds in Michelson-Morley type experiments). This step is a further validation of ``inward-singular light-speed'' to each point (with half-c outward) that introduces novel time-dilation/gravitational fields while accommodating conventional mathematical physics. Additional results bearing on quantum mechanics' temporal entanglement and the long-standing measurement problem are addressed.