An Integrated Interpretation of Quantum Mechanics and Relativity Based on LSIT

This paper, based on the Lee’s Simultaneity Invariance Theorem (LSIT), derives a corollary referred to as the macroscopic indeterminacy theorem, which states that the descriptive requirements imposed on a single physical event are structurally incompatible. From this theorem, a minimal action scale required for the description of an event emerges naturally, and its numerical value is shown to coincide precisely with the Planck constant. This result reinterprets uncertainty not as an intrinsic randomness of nature, but as a universal limitation arising in the process of event description, while the Planck constant serves as the physical scale that quantifies this limitation. From this perspective, the present work provides an interpretative framework that alleviates the conceptual tension between relativity theory and quantum mechanics without introducing additional hypotheses.