Gravitational Modulation of Uranium Decay: Resolving the Pb-Pb Anomaly in Meteorites

High-precision Pb-Pb geochronology of the early Solar System relies fundamentally on the assumption that the uranium decay constants determined by Jaffey et al. (1971) are universal invariants. However, recent isotopic analyses of Calcium-Aluminum-rich Inclusions (CAIs) in primitive chondrites have revealed systematic age discordances and apparent variations in the ratio that challenge this standard. In this work, we propose that these discrepancies are not solely consequences of nucleosynthetic heterogeneity, but manifestations of the Vacuum Metric Coupling (VMC) hypothesis. We demonstrate that the tunneling probability governing -decay is modulated by the local gravitational potential via a dimensionless coupling constant, the Vacuum Coupling Invariant (). By correcting the terrestrial Jaffey constants for the metric potential of the early solar accretion disk, we successfully resolve the chronometric anomalies in CAIs from the Allende and Efremovka meteorites. The model yields concordant ages ( My) consistent with the system, without requiring ad hoc assumptions of variable uranium ratios or extinct . These results suggest that absolute geochronology must evolve into a nucleo-metric discipline, where decay rates are treated as environmentally dependent variables.