Quantum Substrate Dynamics (QSD): A Relativistic Field Model of Emergent Mass, Inertia and Gravity

Quantum Substrate Dynamics (QSD) is a Lorentz-invariant, coherence-based field theory in which mass, gravity, and inertia emerge from phase-stable excitations within a conserved physical substrate. In this model, mass appears as a coherence-locked phase lattice, inertia arises from reconfiguration resistance at coherence boundaries, and gravity results from large-scale tension gradients. QSD reinterprets black holes, dark matter effects, and cosmological structure as fluidic phase transitions, without invoking geometric singularities or exotic matter. While it recovers General Relativity and Quantum Field Theory in limiting regimes, QSD offers falsifiable predictions beyond themincluding geometry-sensitive inertia, scalar precursor waves in supernovae, and coherence-based gravitational echoes in black hole mergers. By anchoring known physics in a conserved coherence field, QSD positions itself as a testable and unifying extension of modern theoretical frameworks.