We propose Photonic Spacetime Fluid Theory (PSFT), a speculative unificationframework in which all four fundamental forces emerge from a single mechanism: light, taken as the fundamental dynamical entity (the "prime mover"), drives the deformation of the spacetime manifold. Spacetime deformations propagate as a relativistic fluid governed by a covariant Navier-Stokes equation defined on the manifold itself, and matter arises as stable solitonic patterns within that fluid, trapped by its viscosity. We present two versions of the master equation. The original (v1) uses ascale-dependent scalar viscosity with smooth exponential suppression. Weidentify six experimental tensions with v1 and propose five structuralmodifications yielding the revised equation (v2), which features conformal (traceless) viscosity, a hard curvature gap via Heaviside activation, agauge-valued viscosity tensor encoding SU (3) (2) (1), Hall viscosity for parity violation, and universal gravitational coupling. We prove three main theorems: (1) ~in the inviscid limit, PSFT reproduces the Einstein field equations exactly (Theorem~12. 1) ; (2) ~the vorticity of the spacetime fluid in a Killing sector satisfies Maxwell's equations with U (1) gauge invariance inherited from the isometry (Theorem~9. 1) ; (3) ~in the high-viscosity regime at subnuclear scales, the theory produceslinear confinement with the correct QCD string tension (Theorem~10. 1). Wefurther derive parity violation and massive mediators for the weak interactionfrom the Hall viscosity term (Theorem~11. 1). We confront PSFT v2 with current experimental data including gravitationalwave observations (LIGO, GW170817, GW250114), solar system tests (CassiniPPN), equivalence principle bounds (MICROSCOPE, LLR), and recent cosmologicalanomalies (JWST, DESI). We identify six testable predictions and five honestlimitations. This is a theoretical exploration. We do not claim established physicalvalidity; rather, we develop the mathematical structure rigorously and examineits consequences.
Yuliyan Lyubenov (Thu,) studied this question.