The Great Attractor and Great Repeller are two prominent large-scale structures in the universe, influencing the motion of galaxies through their gravitational and proposed levitational effects. This paper proposes that the Great Attractor represents a region of strong positive spacetime curvature (gravitational field), while the Great Repeller corresponds to a region of strong negative spacetime curvature (Replusive spacetime curvature "RSC"). These dual fields generate dynamic cosmic flows, analogous to atmospheric high and low-pressure gradients on Earth. By incorporating RSC fields into cosmological models, this framework offers an alternative explanation for phenomena currently attributed to dark matter and dark energy. This perspective suggests that these enigmatic entities may not be as abundant or necessary as previously assumed, providing a new paradigm for understanding the universe’s large-scale structure and evolution.