Unified Space Time: A Repulsive Curvature Baseline Postulate

This preprint postulates that the low density limit of spacetime is a repulsive curvature baseline. Attractive gravity is modeled as an environmentally suppressed departure from that baseline in dense regions. The paper defines the terms operationally, embeds the postulate in Einstein gravity with an environment dependent effective vacuum term, and proposes a falsifiable test using stacked deep void weak lensing via an environment dependent void contrast parameter, eps_void.