Intersubjective Stability: Objective Reality as the Limit of Multi-Agent Inference

Arc IV — Structure Paper 2 Title Intersubjective Stability: Objective Reality as the Limit of Multi-Agent Inference Zenodo DOI 10.5281/zenodo.18225913 This paper addresses the origin of objective physical reality from the standpoint of finite accessibility by modeling objectivity as a limit of convergent inference across multiple agents. Rather than assuming observer-independent facts as primitive, the framework defines objectivity operationally: a property is objective if it is stable under variation of observers, protocols, and inference strategies constrained by finite access. Using tools from information theory and operational equivalence, the paper formalizes intersubjective stability as a fixed point of multi-agent inference. Physical quantities that persist across observers are shown to be those that survive accessibility filtering and protocol variation, while observer-dependent quantities fail to stabilize and cannot serve as reliable elements of physical law. This approach reframes long-standing debates in the philosophy of physics concerning realism, observer dependence, and measurement. Objectivity emerges not from a privileged ontology but from the convergence properties of constrained inference networks. The paper establishes the structural conditions required for shared physical descriptions and prepares the ground for the emergence of intersubjective geometry in the subsequent work. Keywords intersubjectivity; objectivity; multi-agent inference; finite accessibility; operational equivalence; philosophy of physics; foundations Notes (Optional / Internal) Arc IV — Structure (core conceptual paper) Bridges constants-as-bounds to emergent geometry Conceptual backbone for later geometry and gravity papers