Abstract This paper conducts a consistency audit of ontological claims made by the Many-Worlds Interpretation of quantum mechanics. Without proposing any alternative interpretation or modification to the formalism, the analysis examines whether claims of strict unitarity, determinism, and literal permanent branching are jointly admissible under unitary dynamics alone. The central result identifies a required but illicit substitution from approximate to exact orthogonality in decoherence-based branching accounts. Because unitary evolution preserves inner products, permanent branch separation cannot be derived dynamically without additional postulates. Modern “emergent” formulations avoid contradiction only by relinquishing literal ontological status, thereby reclassifying branching from physical ontology to descriptive metaphor. The paper draws no experimental conclusions and advances no new physics; it functions solely as an internal consistency audit of existing interpretive claims.
Abstract This paper conducts a consistency audit of ontological claims made by the Many-Worlds Interpretation of quantum mechanics. Without proposing any alternative interpretation or modification to the formalism, the analysis examines whether claims of strict unitarity, determinism, and literal permanent branching are jointly admissible under unitary dynamics alone. The central result identifies a required but illicit substitution from approximate to exact orthogonality in decoherence-based branching accounts. Because unitary evolution preserves inner products, permanent branch separation cannot be derived dynamically without additional postulates. Modern “emergent” formulations avoid contradiction only by relinquishing literal ontological status, thereby reclassifying branching from physical ontology to descriptive metaphor. The paper draws no experimental conclusions and advances no new physics; it functions solely as an internal consistency audit of existing interpretive claims.
The Many-Worlds Interpretation (MWI) of quantum mechanics preserves unitary evolution by rejecting wavefunction collapse and treating all outcome branches as equally real. While mathematically consistent, this move elevates admissible descriptions of a system to ontological status without an accompanying principle of physical selection. In this paper, we argue that quantum branching need not imply ontological multiplicity once structural admissibility, temporal constraint, and recoverability are made explicit. Unitary evolution defines the space of allowable continuations, but only a subset of these persist forward in time due to structural resolution. Within this framework, the appearance of branching reflects under-resolved admissible paths rather than the realization of multiple worlds. Many-Worlds is thus reinterpreted as a transitional bookkeeping scaffold rather than a necessary ontological commitment.
This work presents a rigorous, first-principles audit of unitarity in quantum mechanics, treating unitarity not as a foundational axiom but as a hypothesis whose validity depends on explicit physical and mathematical assumptions. The analysis is conducted entirely within the operational framework of open quantum systems, using completely positive trace-preserving (CPTP) maps to describe the dynamics of reduced subsystems. By systematically isolating and auditing every prerequisite required for unitary evolution—including perfect isolation, Hilbert-space factorization, linearity, the Born rule, and time parameterization—the manuscript demonstrates that unitarity is neither fundamental nor universal, but instead an emergent, scale-dependent consistency condition. The paper distinguishes clearly between mathematical bookkeeping identities and physically meaningful conservation laws, showing that probability conservation does not require unitarity, and that reversibility and energy conservation are not guaranteed by unitary evolution alone. Explicit, mathematically consistent non-unitary evolution models are constructed, including Lindblad dynamics, non-Hermitian Hamiltonians, stochastic Schrödinger equations, non-Markovian evolution, and quantum Darwinism. The work further identifies the precise regimes in which unitary dynamics emerges as an effective approximation—such as weak coupling, short timescales, or limited observational resolution—and delineates the conditions under which it fails. Empirical evidence from atomic spectroscopy, quantum information processing, decoherence experiments, and measurement theory is used to anchor the analysis without assuming fundamental unitarity. The central conclusion is unambiguous: no physically accessible open or effective subsystem undergoes strictly unitary evolution. Unitarity is shown to be an emergent, conditional, and scale-dependent property rather than a fundamental law of nature. This manuscript is intended as a foundational clarification of the status of unitarity in quantum theory and is suitable for researchers in quantum foundations, open quantum systems, quantum information, and quantum gravity. FUSION OS INNOVATIONS
Abstract This chapter argues for the view that the Everett (‘many worlds’) interpretation is nothing more or less than a literal reading of the formalism of unitary quantum mechanics. The central component of this story is decoherence: the process by which the evolution of the quantum state acquires a branching structure. The chapter gives a conceptual introduction to decoherence and its conceptual role, emphasizing the significance of its effects on the dynamics of degrees of freedom which are undergoing decoherence. It then argues that, although the branching structure generated by decoherence is ‘for all practical purposes’ in the sense that it is not part of the microscopic formalism of quantum theory, nonetheless it is a perfectly real, observer-independent feature of reality — it is emergent from that microscopic formalism in a way very familiar from many other parts of science.
This paper develops a structural critique of the many-worlds interpretation of quantum mechanics (MWT). Using the ontological framework of Structure Theory, it demonstrates that branches, as posited by MWT, cannot exist. Four independent arguments are developed: a quantum superposition is one structural state, not a plurality of worlds; branching requires a transformation event that MWT's unitary dynamics cannot provide; quantum entanglement proves that the subsystems MWT treats as independent worlds share constitutive relations that preclude structural independence; and global unitarity is incompatible with the structural derivation of temporal order. The strongest existing defenses of MWT, including Wallace's emergence account and the parsimony argument, are examined and shown to fail on structural grounds. The paper concludes that branches are not merely unobservable. They are impossible.
This paper constructs a logically self-consistent emergent structural frameworkfor the Many-Worlds Interpretation (MWI) based on decoherence theory, quantum information geometry, and self-referential dynamics. Within this framework,a ”world” is rigorously defined as a quasi-classical branch formed in Hilbert spacethrough environmental decoherence and information-geometric boundaries. Its independence is quantitatively characterized by the branch separation degree Dab defined by the quantum relative entropy between branches. When Dab exceeds a critical value Dc determined jointly by the energy scale of environmental fluctuationsand the decoherence time, the branches separate irreversibly in the informationgeometric sense, constituting independent ”worlds”. Furthermore, by introducingthe concept of a self-consistent observer, this paper demonstrates the dynamic selection mechanism of cosmological laws within the string theory landscape: only thosevacuum branches that can support self-consistent observers (satisfying conditionssuch as the memory decoherence time being much greater than the cognitive operation time) have their wavefunction weights effectively preserved during evolution,thereby acquiring physical reality. Finally, combining Zurek’s envariance argumentwith the requirement of observer memory stability, we show that the Born ruleP(i) = |⟨i|ψ⟩|2 is not an additional assumption but a necessary consequence forthe stable existence of self-consistent observers. This framework provides an operational mathematical foundation for the many-worlds interpretation, transforms theanthropic principle into a dynamic selection problem, and offers an explanation forthe origin of probability based on quantum information principles.
Abstract Modern physics contains celebrated foundational problems whose empirical foundations are exceptionally strong while some ontological narratives attached to them are less tightly constrained. This paper develops a local logic audit of individual inferential transitions from established empirical facts O and accepted formal constraints F to stronger physical or ontological conclusions P. Core Unit: A single inferential arrow: given O and F, does P follow? If (O AND F) does not entail P, P is not declared false; it is returned to the status of an additional premise. Methodology: Subtractive and prior to solution-building—before asking how a proposed process X occurs, the audit asks whether the declared O and F establish that X occurs at all. Adjudication: Once inputs are declared, adjudication is logical rather than interpretive. Factual primacy is epistemic rather than metaphysical: a formal derivation cannot supply its own empirical warrant, and a prediction must return to an independently acquired record before it can function as evidence. Domain-Specific Audits The method is applied through three domain-specific audits, with a transversal question-level audit operating within them rather than constituting a fourth domain: 1. The Double-Slit Experiment: Physical which-path interactions alter the relevant state without requiring any special causal role for conscious observation; sequential localized detections nevertheless accumulate into an interference distribution, while quantum-eraser protocols display conditioned correlations without retroactively changing an earlier local record. 2. Reflexive Born-Rule & Entanglement: Separates empirical success, formal derivation, and ontological explanation. The familiar question "what physically collapses the wavefunction?" is audited before it is answered: a formal state update does not by itself establish an ontic wavefunction undergoing a literal physical collapse. In entanglement, operational differentiation, spatial separation, and dynamical decoupling do not by themselves establish physical severance or exhaustive ontological decomposition; the same audit is applied to the EPR Reality Criterion and to narratives of nonlocal recoordination. Relativistic Physics & Quantum Gravity 3. Background Ontology: The third audit asks what background ontology quantum foundations actually require from relativistic physics. Clock relations and Lorentzian structure do not by itself entail time as an independently fundamental substance or four-dimensional spacetime as the uniquely fundamental ontology. Gravitational phenomena and the tested structure of general relativity likewise constrain any deeper account without uniquely fixing its ontology. The GPS Example: The distinction among ontology, physics, and engineering is made explicit through the GPS example: technological dependence on relativistic timing validates the physical relations required for operation while fundamental ontology remains a further question. Quantum-Gravity Audit: Asks what observation, prediction, or formal structure of established quantum theory presently fails in an empirically demonstrated way because gravity has not been made a fundamental quantum interaction, separating cross-framework consistency from prior commitment to one ontology of the deeper theory.