Born-like squared magnitude is forced by stable composition, not assumed from physics. This paper derives a Born-like squared-magnitude rule as a representational necessity in a pre-physical program. Building on prior results that force (1) plural incompatible stabilization criteria, (2) route dependence with cancellation-capable summaries (phase-like structure), and (3) the need for a stable nonnegative "yield" map, we formalize a yield function rho from summaries to nonnegative real numbers under minimal requirements: phase invariance, additivity over exclusive outcomes, multiplicativity under independent composition, and symmetry under balanced regrouping (no preferred exclusive coordinates). Under mild regularity, multiplicativity restricts rho to a power-law family, and regrouping invariance uniquely selects the quadratic case. The result is a squared-magnitude extraction rule obtained without assuming Hilbert spaces, wavefunctions, inner products, dynamics, hbar, or measurement postulates. The paper concludes by identifying the next forced pressures toward complex realization and norm-preserving (unitary-like) evolution.
Born-like squared magnitude is forced by stable composition, not assumed from physics. This paper derives a Born-like squared-magnitude rule as a representational necessity in a pre-physical program. Building on prior results that force (1) plural incompatible stabilization criteria, (2) route dependence with cancellation-capable summaries (phase-like structure), and (3) the need for a stable nonnegative "yield" map, we formalize a yield function rho from summaries to nonnegative real numbers under minimal requirements: phase invariance, additivity over exclusive outcomes, multiplicativity under independent composition, and symmetry under balanced regrouping (no preferred exclusive coordinates). Under mild regularity, multiplicativity restricts rho to a power-law family, and regrouping invariance uniquely selects the quadratic case. The result is a squared-magnitude extraction rule obtained without assuming Hilbert spaces, wavefunctions, inner products, dynamics, hbar, or measurement postulates. The paper concludes by identifying the next forced pressures toward complex realization and norm-preserving (unitary-like) evolution.
Phase is forced by cancellation, before probability or physics enters the story. This paper continues a constructive sequence deriving only what is logically forced once incompatible closure criteria induce non-commuting stabilization operations. When distinct stabilization routes matter, a state-only description becomes lossy, but explicit route-tracking produces unbounded descriptive growth (“route explosion”). To summarize non-equivalent routes without erasing forced distinctions, the framework is compelled to introduce a contribution carrier and a combination rule. Regrouping invariance forces associativity; null contributions force an identity element; cancellation adequacy forces inverses, pushing the contribution space toward an abelian group (on the generated representational classes). Purely nonnegative scalar accumulation cannot support cancellation, so a phase-like orientation invariant appears prior to probability assignments, amplitudes, Hilbert space axioms, or physical interpretation. Finally, requiring descriptive boundedness under iterative route concatenation pressures the minimal orientation structure toward a compact (periodic) group. The forward pressure is then explicit: extract a nonnegative invariant magnitude from phase-bearing summaries in a way that is phase-invariant, additive over exclusive outcomes, and stable under composition—setting up the next paper’s derivation of a quadratic (Born-like) invariant.
Closed evolution forces norm-preserving symmetry on the minimal complex carrier. This paper continues a forced-sequence program deriving only what is structurally required by prior steps. Given a phase-bearing summary with phase-invariant quadratic yield, we show that faithful representation of continuous compact phase requires a two-dimensional real realization (equivalently, a complex carrier). Defining closed evolution as internal yield-preserving update, we show that yield-preserving additive maps are pressured into the norm-preserving symmetry class (unitary-like, with antiunitary-like orientation reversal remaining logically admissible). The forward pressure is toward interaction via non-commutation when multiple contexts/operators coexist, and toward generator structure from refinement-stable incremental composition. V2- Minor clarifications only (no change in claims): minimality of U(1), antiunitary permissibility, and tighter non-commutation forward linkage.
We show that the quadratic measure associated with the Born rule need not be introduced as an independent probabilistic postulate, but follows, under the stated structural and regularity assumptions, from the compatibility between reversible linear evolution and the formation of stable records. Physical processes alternate between reversible dynamics and episodes of record formation. Quantities that remain well defined throughout such processes must therefore admit a representation that remains consistent across both regimes. Prior to record formation, alternatives combine additively at the level of complex amplitudes, whereas successive record-forming distinctions admit a multiplicative representation through refinement. Requiring compatibility between these compositional structures constrains the admissible weight assignment to the family of weights proportional to the pth power of the amplitude magnitude. The finite-dimensional specialization of Lamperti's isometry theorem then singles out p = 2 as the unique value compatible with continuous reversible linear mixing while preserving total weight. The Born rule therefore emerges as the unique weight assignment compatible with reversible linear composition, multiplicative record refinement, phase invariance, and continuous reversible invariance, without invoking probabilistic assumptions or a specific interpretation of quantum measurement.
How much unitary symmetry does the Born exponent actually need? Within coordinate-additive probability rules—each outcome weighted by a function g of its amplitude modulus—invariance under a single genuine two-coordinate mixer already forces the quadratic g(x)=cx2 for every dimension n≥3, where the standard route (Gleason 1957; Hossenfelder 2021; Gogioso 2023) assumes the full unitary group. A single beam-splitter-like unitary on two coordinates, with phase freedom, reduces the invariance condition to a measurable Jensen (midpoint) functional equation whose only solutions are quadratic; the forced weight functional obeys the parallelogram law, so Jordan–von Neumann polarization reconstructs the inner product. The result is a characterization and a no-go, not a derivation of the Born rule: any axiomatization in this class demanding even one genuine mixing symmetry has already presupposed the inner product, so ‘why the exponent is two’ coincides with ‘why coordinate mixing is unitary’. Generalized permutations alone leave the exponent free; the forcing fails at n=2, mirroring Gleason’s dimension threshold; and the intermediate regime is empty for the two symmetry classes treated. Exact-arithmetic and numerical certificates are included. Target venue: Foundations of Physics. v2 (August 2026) — premise-level correction. The symmetry premise is restated at the level at which it holds, the weight functional: invariance of the normalised probability rule does not follow from it, and an explicit counterexample is given. A global probability-level invariance premise is shown to be vacuous for any genuine mixer with non-vanishing quadratic weight, and domain-of-definition conditions are made explicit. A prior-art and novelty assessment accompanies this version. Earlier versions remain in the version history.
This paper shows how the L2 norm underlying the Born rule arises as a phase-invariant quadratic observable when linear spectral representations are applied to discrete systems governed by L1 structure. Rather than assuming Hilbert space geometry, the result demonstrates how quadratic probability emerges from a combination of discrete combinatorics, linear representation, and phase invariance. The central result establishes that, given an underlying L1 causal structure, a linear spectral representation of states, and invariance under phase rotations, the expected observable magnitude under uniform phase averaging reduces to a sum of squared amplitudes. This recovers the L2 norm and yields the Born rule after normalization. Within this framework: Discrete systems are modeled using L1-based combinatorial structure Observers introduce linear complex representations of these systems Phase variables act as unobservable degrees of freedom and are averaged using a uniform invariant measure Cross-terms cancel under phase averaging, leaving a purely quadratic observable This provides a structural explanation for why quantum probability takes a quadratic form. The result can be interpreted as a consequence of Parseval-type identities applied under phase invariance, rather than as an independent postulate. The paper includes: A formal derivation of the quadratic observable from phase averaging A proof that only the quadratic (p = 2) measure preserves underlying combinatorial volume Numerical validation demonstrating consistency with Parseval identity Simulations reproducing standard interference behavior and norm preservation A construction showing compatibility between defect-based dynamics and Schrödinger-type evolution under additional assumptions The work does not attempt a full derivation of quantum mechanics. Instead, it establishes how L2 structure and Born-rule probabilities arise naturally from discrete L1 systems when represented in a linear spectral form with phase invariance. This result connects discrete geometry, harmonic analysis, and quantum probability, and provides a bridge between combinatorial models and continuous Hilbert space representations.
(This work presents an initial conceptual formulation of the renormalization-based approach to quantum theory within the TQF framework. A subsequent version 2 develops formulation of the Quantum reconstruction based on a linear state space, providing derivation of quantum-mechanical kinematics—including the emergence of the Hilbert space structure and the Born rule—from resolution independence. Readers primarily interested in the formal derivation are encouraged to consult the later versions, while the present work may be viewed as outlining the guiding ideas and initial physical intuition behind the quantum reconstruction.) The mathematical structure of quantum mechanics is traditionally introduced axiomatically, with the linearity of the state space, the Hilbert space structure, and the Born rule postulated independently. In this work, we investigate whether these features can instead emerge from a fundamental symmetry principle: the absence of a preferred scale, implemented as invariance ofphysical observables under coarse-graining transformations. We formulate a framework in which physical states are represented as functionals over configuration space and are subject to a family of coarse-graining transformations forming a renormalization group (RG) semigroup. Physical observables are required to be invariant under these transformations, while dynamical operators are allowed to transform covariantly withinthe induced RG flow. Under general consistency conditions—including associativity, symmetry, continuity, and invariance under refinement—we show that the admissible composition law of states admits an additive representation up to an invertible reparametrization, leading to a linear structure of the state space in reparametrized variables. Imposing consistency of weight assignments under coarse-graining further constrains the norm, selecting a quadratic form and inducing an inner product structure. As a result, the space of states acquires the structure of a complex Hilbert space without being postulated a priori. Within this framework, probability emerges as a measure induced by the state functional. By analyzing the transformation of weight assignments under coarse-graining, we identify an effective renormalization group flow in the space of admissible probability rules and show that the quadratic rule arises as a distinguished and heuristically stable fixed point. This provides adynamical origin for the Born rule. We further analyze the semiclassical regime, in which coarse-graining suppresses interference between configuration sectors, leading to decoherence and the emergence of effective classical behavior. In this limit, classical dynamics and an effective notion of time arise from the phase of the state functional, and an approximate Schr¨odinger equation is recovered for fluctuations. These results suggest that the core structural features of quantum mechanics can be understood as universal fixed-point properties of an underlying renormalization symmetry acting on the space of states. This perspective provides a conceptual bridge between quantum mechanics and scale-invariant quantum field theories, including the Timeless Quantum Field framework.