Acoustic Gravitic Theory: A Plasma-Based Model of Gravity, Light, and Cosmic Structure

Acoustic Gravitic Theory derives gravity, inertia, and mass as consequences of matter situated within an energetic wave field carried by a structured fluid plasma medium. Matter is not an active agent that pulls other matter across a distance. It is a wave-bound nodal resonance introduced into a medium whose pressure structure acts upon it. The three properties that Newton left inherent to matter and Einstein reassigned to geometry are, in this framework, one coupling of matter to the surrounding wave field, seen three ways. The framework rests on two governing equations. The field law, g (r) = β (r) / (1+β (r) ) · vA² (r) /r, determines the strength of gravity from measured plasma alone, reconstructing the gravitational parameter of the Sun at order unity from the magnetic field, density, and temperature measured at Mercury's own radius, with no gravitational constant inserted. The loading law is the exponentially loaded node dispersion, (ω · eU) ² = (c k · e^ (−U) ) ² + ω₀², with the coupling depth U (r) supplied by the field law. The two loading slopes are pinned by independent measured coefficients: the temporal slope by the gravitational frequency shift measured by Pound and Rebka in 1960, the spatial slope by the full 1. 75 arcsecond deflection of starlight measured by Dyson, Eddington, and Davidson in 1919. The composition is forced by relational locality, the medium's own layered-transmission law, and admits the exponential as its only solution. From those two equations, with nothing added and nothing tuned, the framework determines the inverse-square force, the gravitational frequency shift, the full light deflection, the signal delay across the field, the perihelion advance of Mercury at coefficient six exactly, the momentum law of moving matter, the universality of free fall, and every higher-order coupling coefficient. Mercury's advance returns 43. 0 arcseconds per century against the observed value near 43. Venus, Earth, and Mars advances, the 247 microsecond Shapiro delay round trip past the solar limb, and the Hubble tension resolution all follow from the same construction. The observed values entered no step of any derivation. The empirical foundation is the seven-decade in-situ record of the heliospheric plasma medium through Helios, Voyager, Ulysses, ACE, Wind, STEREO, Cluster, THEMIS, MMS, IBEX, Parker Solar Probe, Solar Orbiter, MESSENGER, and BepiColombo, with the SLACS lensing catalog, Pantheon-Plus and DESI DR1 supernova and BAO datasets, the NANOGrav pulsar timing background, the Planck CMB power spectrum, the MICROSCOPE free-fall test, and the Lamb shift spectroscopy anchoring the cosmological and atomic reaches of the framework. Every prediction is accessible to direct measurement through existing or near-term instrumentation, and the framework is falsifiable at every scale it addresses. What Newton left as agency without mechanism, and what Einstein left as geometry without substrate, this framework restates as pressure with a measured source acting on matter that is itself a wave structure of the same medium.