Abstract This paper proposes a minimal formal criterion for physical entity. It does not attempt to derive quantum mechanics, general relativity, quantum gravity, or any empirical prediction. Its aim is narrower: to ask what formal conditions must be satisfied before a structure may be treated as a physical entity at all. The starting point is the principle of stable distinguishability: a physical theory is possible only where distinctions can be made and re-identified under admissible change. From this requirement, the paper develops a constraint-primacy framework in which no particle, field, spacetime point, state, measurement, or observable is assumed as primitive. The formal layer consists of tokens, admissibility, and a closure operator defined on the full power set of tokens. Identity is reconstructed as closure-equivalence. Boundary is defined non-spatially as first-entry dependency, and core is defined non-circularly as a closed non-boundary substructure. A physical entity is then defined as a boundary-stable closure-core equivalence class: a closed admissible structure whose core closure-identity is preserved under relevant boundary-mediated extensions. The paper uses familiar mathematical tools, including closure, equivalence, isomorphism, and invariance; its proposed contribution is not those tools themselves, but the ontological criterion they support.
Abstract This paper proposes a minimal formal criterion for physical entity. It does not attempt to derive quantum mechanics, general relativity, quantum gravity, or any empirical prediction. Its aim is narrower: to ask what formal conditions must be satisfied before a structure may be treated as a physical entity at all. The starting point is the principle of stable distinguishability: a physical theory is possible only where distinctions can be made and re-identified under admissible change. From this requirement, the paper develops a constraint-primacy framework in which no particle, field, spacetime point, state, measurement, or observable is assumed as primitive. The formal layer consists of tokens, admissibility, and a closure operator defined on the full power set of tokens. Identity is reconstructed as closure-equivalence. Boundary is defined non-spatially as first-entry dependency, and core is defined non-circularly as a closed non-boundary substructure. A physical entity is then defined as a boundary-stable closure-core equivalence class: a closed admissible structure whose core closure-identity is preserved under relevant boundary-mediated extensions. The paper uses familiar mathematical tools, including closure, equivalence, isomorphism, and invariance; its proposed contribution is not those tools themselves, but the ontological criterion they support.
Foundational problems in physics—including quantum measurement, spacetime emergence, gravitational dynamics, nonlocality, the arrow of time, and the status of physical existence—are typically addressed in isolation, via model-dependent extensions or interpretive assumptions. This work proposes a different approach. We introduce a constraint-based framework, the Closure Admissibility Principle (CAP), which specifies minimal structural conditions any physical description must satisfy in order to be globally consistent. CAP is formulated in operational terms, using admissibility of states, recoverability under refinement, and stability of closed records, without assuming spacetime, dynamics, or ontology a priori. We show that enforcing these constraints induces a unifying closure structure on law-space, from which several persistent foundational puzzles are resolved as structural consequences rather than postulates. In particular, collapse is reclassified as record selection, spacetime and gravity emerge only in compressible regimes, General Relativity appears as an infrared universality class rather than a fundamental law, singularities correspond to failures of admissible description, and null (“nothing”) models are excluded as inadmissible fixed points. The framework is explicitly falsifiable via operational and weak-field tests, and its scope and limits are stated precisely. The results suggest that many foundational paradoxes arise not from incomplete dynamics, but from admitting globally incoherent physical descriptions.
The Admissibility of Natural Physics, Part I begins where an admissibility-first reconstruction of single-system quantum mechanics ends. Its central question is not whether the familiar tensor-product formalism can be assumed, but whether any physical composition law can be derived without importing composite systems, global state spaces, entanglement, locality, or signalling as primitives. The book develops a disciplined reconstruction of binary quantum composition from operational and structural requirements. It first records the exact content and limitations of the inherited single-system closure, establishes dependency and non-circularity statutes, and introduces the possible object of natural physics only as a provisional target ledger rather than as an assumed ontology. It then examines joint preparation, product states and effects, marginal consistency, operational no-signalling, minimal and maximal probabilistic composites, local tomography, and the classification of admissible tensor-product representations. Particular attention is given to the distinction between a mathematical representation theorem and the uniqueness of a physical composition rule. Real, complex, quaternionic, Jordan-algebraic, minimal, maximal, restricted, and non-tomographic alternatives are compared under explicitly declared admissibility conditions. The complex Hilbert-space tensor product is recovered only on branches satisfying the required factorization, coherence, scalar, and operational closure conditions. Where several inequivalent composites survive, the result is a classified family rather than a falsely asserted uniqueness theorem. Entanglement is introduced only after composition has been commissioned. It is defined as the failure of an admitted joint state to belong to the convex closure of admitted product preparations. The analysis proves, within the resulting predictive grammar, that entanglement is a property of composite-state geometry, not an additional force, substance, interaction mechanism, or signalling channel. Throughout, the argument enforces quotient primacy, refinement stability, finite diagnostic closure, regeneration stability, explicit dependency receipts, local termination, and the possibility of Undefined as a legitimate scientific outcome. Part I therefore supplies neither a speculative ontology nor a presupposed many-world formalism. It provides a conditional classification theorem for binary physical composition and identifies precisely what remains to be established before interaction, repeated composition, particle identity, locality, fields, symmetries, and particle content may be addressed.
This paper is archived as a speculative research work. The preceding manuscripts demonstrated that classical mechanics, general relativity, and quantumeld theory can each be reconstructed as stable interface-level representations of a single scalar eld,without assuming spacetime, dynamics, particles, or energy as fundamental primitives. This nalpaper completes that program by addressing the question such reconstructions leave unresolved:why any physical representation is possible at all. We show that representational success alone isinsucient for ontological adequacy, and we identify the minimal non-representational constraintsthat underwrite all physical descriptions. These constraintsalgebraic possibility, admissibility,persistence, and causalitydo not constitute additional physical layers or entities. Rather, theyspecify the conditions under which manifestation and representation can occur. Physics is therebyreinterpreted as the study of interface-stable compressions of admissibility, and its major theoreticalframeworks are shown to arise as xed points of representational necessity rather than as discoveriesof fundamental constituents. The resulting framework explains both the eectiveness and the limitsof physical theory while preserving the empirical discipline of physics. Ontology is not extendedbeyond physics; it begins precisely where representation necessarily fails.
Modern physics provides empirically complete and highly successful descriptions of local dynamics. General relativity specifies the causal evolution of spacetime geometry, and quantum mechanics specifies the unitary evolution of states. Despite this success, both frameworks leave implicit a foundational question: when a dynamically admissible configuration can be regarded as physically realized as part of a coherent world. This work introduces a minimal, non-dynamical realization criterion that formally closes this gap. Physical realization is defined as a global, temporally organized admissibility condition constrained by relativistic causality. The criterion does not modify any local equations of motion, introduce new forces, fields, particles, or degrees of freedom, nor alter the mathematical structure of existing theories. Instead, it identifies realization as an organizational condition required for dynamical solutions to become physically instantiated. A minimal causal bound T = L / c is shown to follow directly from relativistic causal structure, implying a finite organizational time for global coherence across a spatial extent L. The associated inverse scale Ω = c / L is clarified as a structural constant rather than a dynamical frequency: it has no oscillatory interpretation, carries no energy, and does not represent a physical process. Its role is purely limiting—it marks the minimal global temporal orientation required for realization to persist. Within this framework, classical gravitational optics, delayed global geometric organization, and quantum outcome realization arise as direct consequences of the same realization criterion. The contribution of this work is exclusively structural: it makes explicit a condition already implicit in successful physical theories and provides a formal closure without extending or revising their dynamics. This paper concludes a broader research program on temporal realization, gravitational organization, and global coherence by isolating realization as a necessary condition for physics to describe a world at all.
A recurring interpretive move in quantum physics treats the loss of observational distinguishability as equivalent to the loss of ontological structure. In this paper, I show that the formal structure of the theory does not support that move. I prove the Structural Persistence Theorem, which identifies precisely which algebraic invariants survive arbitrary completely positive trace-preserving (CPTP) maps. The invariants form a natural and complete set: the C*-algebra of observables A = B(H), its norm, commutation relations, and positivity structure. No CPTP process removes any observable from the algebra. State-space distinguishability contracts; algebraic structure does not. This partition — preserved structure versus contracted epistemic access — is the core formal result of the paper. I identify and formally diagnose a specific class of ontological overclaiming in the decoherence literature: instances where pointer-basis selection and suppression of off-diagonal density matrix elements are treated as eliminative of superposition. I show exactly where these inferences overreach the formalism and provide corrected formulations. I then demonstrate that this criterion places formal constraints on how the major quantum interpretations can consistently attribute ontological change. Many-Worlds and pilot-wave theory are fully consistent with the criterion. Copenhagen's physical-collapse reading carries an unspecified mechanism burden. GRW and CSL objective collapse models are PC-violating by deliberate design — which the framework clarifies rather than criticizes. Any empirical confirmation of GRW/CSL predictions would constitute direct evidence for PC-violation in nature. Two practical applications are discussed. In quantum error correction, the success of the fault-tolerance threshold theorem is indirect empirical evidence for the Persistence Criterion: decoherence degrades distinguishability but leaves the algebraic structure intact, which is precisely what makes error recovery possible. In effective field theory, the persistence of UV degrees of freedom under coarse-graining is consistent with the same structural partition. This work proposes no new experimental predictions. It clarifies what the existing formalism entails and does not entail — drawing a sharp, formal boundary between what the mathematics licenses and what must be supplied by interpretation.
Modern theoretical physics faces an abundance of mathematically consistent frameworks and a scarcity of decisive empirical constraints. This work proposes a principled response to that situation by identifying stability under intervention as a primary selection criterion for viable physical theories. Adopting an explicitly operational perspective, the paper formulates stability as the non-amplification of operational distinguishability under physical processes, a requirement motivated by the finite precision and reproducibility of experimental practice. When combined with compositional consistency, purification, and reversible symmetry, this principle strongly constrains admissible statistical frameworks. Within this setting, quantum theory emerges not as a fundamental ontology or a historically contingent choice, but as the uniquely stable non-classical fixed point compatible with reproducible physical control by finite agents embedded within the systems they study. The defining structural features of quantum mechanics, including convex state spaces, affine dynamics, state–effect duality, and a Born-type probability rule, arise as consequences rather than postulates. The framework further suggests that spacetime locality and geometry need not be assumed a priori, but can be understood as constraints on the propagation of distinguishability in composite systems. Potential deviations from quantum theory are predicted to manifest as failures of stability, such as breakdown of dilation, violation of distinguishability monotonicity, or loss of local tomography. This repository contains the final submission-ready manuscript together with its LaTeX source and bibliography, deposited on Zenodo prior to journal submission.This version (v1.1) incorporates clarifications on scope, logical dependencies between principles, worked examples within the Jordan-algebra classification, strengthened hedging of speculative material, and refined statements of falsifiability, in response to detailed referee feedback.