The Boundary-First Black Hole: A Geometric-Systems Synthesis of Energy-Phase Transition Theory, Boundary Release (T5), and Spacetime Memory

The Boundary-First Black Hole: A Geometric-Systems Synthesis of Energy-Phase Transition Theory, Boundary Release (T5), and Spacetime Memory Description:This paper presents an interdisciplinary synthesis of black hole interior physics and systems-level boundary dynamics. Building from the Energy-Phase Transition Theory (EPTT) (Alshokary & Rashwan) and an independent systems interpretation (“T5 boundary release” articulated in the Vengerovsky discussion thread), the work argues that black holes should be modeled as boundary-first systems: regimes where classical matter-language (pressure, volume, internal storage) ceases to apply beyond Planck density, while mass and conserved quantities remain encoded on the event horizon through extrinsic curvature. The paper proposes four novel, testable organizing claims derived from cross-pollination of the source set: Structural Offloading: the event horizon functions as a mechanically load-bearing surface when volumetric physics becomes undefined, making mass interpretable as boundary tension rather than trapped interior content. Geometric Saturation Stability: stability may arise from the deletion of definable resistance (no pressure/gradients) rather than balance of opposing forces. T5 Universal Flush: jets and quasar outflows can be framed as thermodynamic maintenance channels—ordered boundary release when local bookkeeping fails in high-flux accretion regimes (e.g., MAD-like saturation). Spacetime Hysteresis (“scar memory”): vacuum-like terms with dependence on collapse history (Λ(ρ)) imply path dependence and gravitational memory. A key emphasis is falsifiability: the paper identifies observational handles already present in EPTT—such as ringdown modifications and echo absence/suppression—and distinguishes interior-physics claims from disk-neighborhood accretion/jet mechanisms to preserve scope integrity. This work is intended for researchers and advanced readers in black hole physics, quantum gravity foundations, systems theory, and computational interpretations of thermodynamic release. It is explicitly a synthesis paper: it does not claim definitive resolution of quantum gravity, but offers a coherent boundary-first framing that generates concrete “if-then” predictions and unifies multiple explanatory layers under a single structural logic.