USP Field Theory — Δf Magnetic Flip Law: Mass-Influx Trigger and Core Instability Dynamics

This work introduces the Δf Magnetic Flip Law under USP Field Theory, demonstrating that magnetic field reversals are driven by mass-influx dynamics rather than rotation-based effects. As stars and planets evolve, heavy-element sinking or fusion byproducts increase internal mass influx (M_in), causing Δf tension to accumulate inside the core. When Δf_core surpasses the stability threshold F_thresh, the resonant magnetic corridor collapses and reforms in a reversed orientation. The model explains why: stars flip rapidly (high M_in from fusion), planets flip slowly (weak mass settling), dead bodies like Mars never flip (M_in → 0). The Δf Magnetic Flip Law provides a unified explanation across msf:44696 (corridors), msf:45706 (reversal), msf:45718 (fusion), msf:45719 (dead cores), and msf:45740 (gravity). Magnetic flips become a mass-driven chronometer of core maturity rather than a spin anomaly. Figures included in the document illustrate: 1. Δf buildup and the flip threshold, 2. Earth vs. Mars core Δf timelines, 3. The full Δf_core accumulation equation. This paper is the foundational reference for Δf-based magnetic reversal modeling in USP Field Theory.