Boundaries of Causality and the Origin of Fundamental Constants

This paper is archived as a speculative research work. Physical law presupposes causality, yet the origin and limits of causality itself are rarely examinedas primary constraints. In this work we show that causality requires boundaries—both temporal andspatial—and that fundamental constants arise as invariant readouts of those boundaries at the inter-face level. Building on the Entanglement–Algebraic Spacetime (EAS) framework, we demonstratethat the speed of light, Planck’s constant, and black hole horizon saturation are not independentprimitives, nor interchangeable definitions, but distinct boundary isolations (“measurement seats”)of a single underlying kernel. Each constant corresponds to the failure mode of a specific type ofcausality: temporal ordering, historical resolution, or spatial representability. We show that whileconstants are algebraically related once an interface is fixed, their operational measurement seats arenon-invertible. This clarifies why constants cannot be derived from one another operationally, whygeometry and kinematics cannot be quantized indiscriminately, and why black holes play the samecausal role for space that massless particles play for time. The result is a unified boundary-basedunderstanding of physical law, in which constants are neither arbitrary nor reducible, but necessaryfor existence itself.