Radiation and Gravity: A Unified Geometric Syntax

A focused conceptual–operational framework presenting a shared geometric structure between radiation and gravity, based on flow, acceleration, and area. Through a stellar-surface mapping using the parameter φ = L / (M a) (dimensionally: velocity), the formulation establishes parallels with horizon thermodynamics and connects directly to Eddington’s balance. The model allows closure on G or M from a single object, supports cross-instrument calibration, and motivates population-level geometric tests.