This work introduces the Modular Superselection Framework, a mathematical and conceptual proposal based on the assumption that a quantum system may be structured into modular sectors labeled by a conserved quantity defined modulo an integer MMM. In this framework, observable states must remain within a single sector, and transitions between sectors are restricted by the modular selection rule ΔQ≡0(modM)\Delta Q \equiv 0 \pmod{M}ΔQ≡0(modM). The work develops this idea axiomatically, presenting formal definitions, structural propositions, and examples illustrating its internal coherence. Unlike standard superselection rules derived from symmetry groups or environmental decoherence, the modular architecture is introduced as a primitive structural feature of Hilbert space. Its goal is not to describe existing physics, but to provide a mathematically consistent, falsifiable, and expandable theoretical scaffold for future investigations in quantum foundations, mathematical physics, and the study of constrained quantum systems.
This work introduces the Modular Superselection Framework, a mathematical and conceptual proposal based on the assumption that a quantum system may be structured into modular sectors labeled by a conserved quantity defined modulo an integer MMM. In this framework, observable states must remain within a single sector, and transitions between sectors are restricted by the modular selection rule ΔQ≡0(modM)\Delta Q \equiv 0 \pmod{M}ΔQ≡0(modM). The work develops this idea axiomatically, presenting formal definitions, structural propositions, and examples illustrating its internal coherence. Unlike standard superselection rules derived from symmetry groups or environmental decoherence, the modular architecture is introduced as a primitive structural feature of Hilbert space. Its goal is not to describe existing physics, but to provide a mathematically consistent, falsifiable, and expandable theoretical scaffold for future investigations in quantum foundations, mathematical physics, and the study of constrained quantum systems.
This work introduces a falsifiable symbolic field framework for modeling quantum-like behaviors under explicit structural constraints. Rather than modifying the formalism of quantum mechanics or proposing a new physical ontology, the paper investigates which behaviors associated with quantum systems persist within a restricted class of admissible dynamics—defined as bounded, well-posed, and stable under perturbation. At the core of the framework is a bounded nonlinear stabilizing function, KN, which constrains symbolic field evolution within a modular phase space. Within this constrained regime, phenomena commonly associated with quantum mechanics—interference, collapse-like transitions, entanglement, memory persistence, and decoherence—emerge as structural consequences of resonance, phase alignment, and admissibility filtering rather than as observer-dependent postulates. Using four simulation-based tests, the paper demonstrates that: Linear superposition fails under KN modulation, producing bounded asymmetry rather than cancellation. Symbolic memory decays without active modular reinforcement and persists only under feedback. Collapse-like transitions propagate synchronously across phase-aligned symbolic fields. Decoherence emerges from stochastic phase drift without invoking measurement or observation. The framework reframes collapse as resonance locking, entanglement as modular phase alignment, and decoherence as admissibility failure induced by phase instability. These mechanisms do not alter the empirical predictions of quantum mechanics, but instead clarify the structural conditions under which quantum-like behavior survives. This work is intended as a structural and methodological contribution, providing a constrained symbolic model that complements existing quantum theory and connects ideas from nonlinear dynamics, decoherence, and constructive field theory. It forms part of a broader research program exploring admissibility as a unifying principle across physical, symbolic, and informational systems.
This work presents an axiomatic and structural reconstruction of core elements of quantum mechanics. Starting from minimal principles — symmetry under vanishing preference, normalization, consistency of probability assignments, and coherence-preserving dynamics — we derive several central features of the quantum formalism rather than postulating them. Key results include: A geometric derivation of the constants 1/21/\sqrt{2}1/2 and 1/21/21/2 from symmetry and normalization. A theorem-level derivation of the Born rule (including the qubit case) from noncontextuality and additivity. A reconstruction of Schrödinger dynamics from reversible norm-preserving structure. A derivation of the tensor-product structure for composite systems from composition axioms and local tomography, with entanglement emerging as a necessary consequence. Formal treatment of Bell–CHSH nonlocality, Tsirelson’s bound, and no-signalling. A conditional reconstruction of complex Hilbert space structure from intrinsic phase dynamics and compositional consistency. The manuscript is self-contained and framed in standard mathematical-physics language. It does not propose modifications to quantum mechanics, but instead clarifies why many of its defining structures arise inevitably from deeper structural constraints. Prior computational and model-based work by the authors (including diagnostic toy models exploring phase locking, coherence stabilization, and recursive-time dynamics) is acknowledged but intentionally not reproduced here, in order to keep the present work focused on axiomatic structure rather than model-specific architecture. This upload is intended as a foundations and reconstruction contribution, suitable for readers interested in the mathematical and conceptual structure of quantum theory.
We propose that spacetime topology fundamentally constrains the structure of quantum state space, leading to a new category of quantum mixed states that cannot be purified by any physical process. On a 4-dimensional manifold with non-trivial first Stiefel-Whitney class w₁ᵀ≠0, the Pin⁺ bordism classification Ω₄^{Pin⁺}=Z₁₆ leads to superselection sector splitting H=H₊⊕H₋. The resulting mixed state ρ = p₊ρ₊ ⊕ p₋ρ₋ is fundamentally mixed—it cannot be purified by including environmental degrees of freedom, because the superselection rule is a topological constraint on the Hilbert space itself. We establish three unconditional results: (1) a topological No-Go theorem proving that fundamental mixed states cannot be purified by any physical operation, (2) a classification of quantum mixedness distinguishing three types—improper (purifiable), strong-to-weak spontaneous symmetry breaking (dynamically non-purifiable), and fundamental (topologically non-purifiable)—and (3) an information protection-shielding duality showing that superselection rules simultaneously protect intra-sector quantum information (via the Knill-Laflamme condition) and shield inter-sector classical information (via topological non-purifiability). These results place fundamental mixed states outside the axiomatic framework of Yang, Shi, and Lee (2025) for topological mixed states, as they violate the local recoverability axiom (P0) for topological rather than dynamical reasons. Conditional on the sector label k being a quantum-mechanical observable, we further show that measurement can be understood as sector determination—a local observer discovering which topological sector the system occupies—and that quantum probabilities arise from irreducible ignorance of global topological quantities (topological epistemology). Our approach requires no new parameters or particles beyond the assumption w₁ᵀ≠0, and makes falsifiable predictions including CMB TB/EB polarization from global topological CPT modification (dual-channel falsifiability architecture) and a fermion-boson decoherence asymmetry. This work opens the direction of topological quantum foundations—the study of how spacetime topology constrains the structure of quantum theory.
This paper presents a novel framework for constructing modular quantum field theories (QFTs) designed to facilitate efficient simulation of complex quantum phenomena. Traditional QFTs often struggle with scalability and complex dynamics, hindering their application to real-world problems. This work proposes a method of representing QFTs as a collection of interconnected modules, each representing a fundamental physical process. The resulting system offers significant advantages in terms of simulation, analysis, and adaptability, paving the way for breakthroughs in areas such as condensed matter physics, materials science, and quantum computing. We explore the design principles and mathematical foundations of this approach, demonstrating its potential to overcome limitations inherent in existing QFT techniques. This paper provides a comprehensive overview of the proposed framework and its implications for future research.
A unified scheme for treating generalized superselection sectors is proposed on the basis of the notion of selection criteria to characterize states of relevance to each specific domain in quantum physics, ranging from the relativistic quantum fields in the vacuum situations with unbroken and spontaneously broken internal symmetries, through equilibrium and non-equilibrium states to some basic aspects in measurement processes. This is achieved by the help of c → q and q → c channels: the former determines the states to be selected and to be parameterized by the order parameters, and the latter provides the physical interpretations of selected states in terms of order parameters. This formulation extends the traditional range of applicability of the Doplicher-Roberts construction method for recovering the field algebra and the gauge group (of the first kind) from the data of group invariant observables to the situations with spontaneous symmetry breakdown: in use of the machinery proposed, the physical and mathematical meaning of basic structural ingredients associated with the spontaneously broken symmetry are re-examined, such as the degenerate vacua parameterized by the variables belonging to the relevant homogeneous space, the Goldstone modes and condensates, etc. The geometrical meaning of the space of order parameters is naturally understood in relation with the adjunction as the classifying space of a sector structure. As further examples of applications, some basic notions arising in the mathematical framework of quantum theory are reformulated and examined in connection with control theory.
For orthodox quantum systems, pure states correspond one-to-one to all one-dimensional subspaces and observables correspond one-to-one to all selfadjoint operators in the state space. A relaxation of this one-to-one correspondence will bring about superselection rules. A general formulation of superselection rules is technically complicated. 1 We shall adopt an intuitive approach here and limit our discussion to some special cases to see how superselection rules can be incorporated in a Hilbert space structure of quantum theory.