Gravity, Gravitational Waves, and Buoyancy in USP Field Theory: Resonance Slopes, Field-Tension Reconfiguration, and Medium-Dependent Equilibrium Layers

This paper develops a USP Field Theory interpretation of gravity, gravitational waves, and buoyancy using resonance-slope geometry and operational Delta-f proxies. Gravity is interpreted as an effective spatial gradient of resonance mismatch. In text form, the core bridge is: g_eff = -alpha_g grad(Delta f_proxy) This is not proposed as a replacement for Newtonian gravity or General Relativity. Instead, the standard gravitational potential gradient remains the predictive baseline, while USP language provides a mechanism-level interpretation. Gravitational waves are interpreted as finite-speed field-tension reconfiguration pulses. The observable remains detector strain h(t), while the USP residual mapping is written in text form as: delta grad(Delta f_proxy) = kappa_h h(t) |grad(Delta f_proxy)|_baseline This preserves the requirement that gravitational-wave disturbances propagate at c and remain consistent with LIGO/Virgo/KAGRA observations. Buoyancy is interpreted as medium-dependent equilibrium-layer selection. The classical Archimedes result remains the predictive baseline: F_buoy = rho_fluid V g USP adds the interpretation that an object stabilizes where the gravitational resonance slope and the medium response balance: grad(Delta f_grav) + grad(Delta f_medium) = 0 The paper also introduces calibration examples, uncertainty-budget rules, null-test protocols, a locking-index boundary for fluid sorting versus structural support, and a minimal Python simulation appendix for buoyancy stratification.