Abstract
In 1955, Lee and Yang discussed a new massless gauge field based on the established conservation of baryon number. They predicted the existence of a very weak repulsive force between baryons. Such a repulsive long-range force may be the physical origin of the dark-energy-induced acceleration of the expansion of the universe. The accelerated Wu transformation of spacetime based on limiting Lorentz and Poincare invariance is employed to investigate the Wu-Doppler effects in which the source and observer have linearly accelerated motion. The results are applied to discuss experimental detections of the accelerated expansion of the universe.