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The Geometric Origin of Quantum Axioms: Emergence of Complex Numbers and the Born Rule from Split-Quaternionic Krein Algebra (Part III)

Masayuki Note

Published Jan 25, 2026• 0 citations
Publisher

Abstract

This paper is the third installment (Part III) of a research series dedicated to the geometric and algebraic foundations of higher-derivative scalar theories. Following the structural uniqueness of the $\Box^2$ operator (Part I: arXiv:2512.16955) and the emergence of spin-analogous dynamics (Part II), this work addresses the most fundamental axioms of quantum mechanics (QM). Key findings presented in this manuscript: Geometric Origin of Complex Numbers: We demonstrate that the standard complex field $\mathbb{C}$ of quantum mechanics is not a fundamental postulation but an emergent infrared (IR) feature. In the Split-Quaternionic Krein Algebra (PQA), the decoupling of heavy indefinite-metric modes at the Lee-Wick scale ($M \approx 11.3$ TeV) naturally reduces the internal degrees of freedom to a complex subalgebra isomorphic to $\mathbb{C}$. Derivation of the Born Rule: We show that the Born rule ($P = |\psi|^2$) emerges as the unique, positive-definite inner product consistent with the internal Krein metric $\eta$ after projecting out ghost-sector excitations. Algebraic Necessity of the Quadratic Form: The paper provides a rationale for the second-power dependence of probability, linking it to the conservation of the bilinear form under pseudo-unitary time evolution. By reframing standard QM as a low-energy manifestation of PQA geometry, this study provides a consistent "Why" for the mathematical structure of our quantum reality, suggesting that the "ghosts" of higher-derivative theories are the very keys to understanding the origin of quantum axioms.

DOI
10.5281/zenodo.18364895

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This paper is the third installment (Part III) of a research series dedicated to the geometric and algebraic foundations of higher-derivative scalar theories. Following the structural uniqueness of the □2\Box^2□2 operator (Part I: arXiv:2512.16955) and the emergence of spin-analogous dynamics (Part II), this work addresses the most fundamental axioms of quantum mechanics (QM). Key findings presented in this manuscript: Geometric Origin of Complex Numbers: We demonstrate that the standard complex field C\mathbb{C}C of quantum mechanics is not a fundamental postulation but an emergent infrared (IR) feature. In the Split-Quaternionic Krein Algebra (PQA), the decoupling of heavy indefinite-metric modes at the Lee-Wick scale (M≈11.3M \approx 11.3M≈11.3 TeV) naturally reduces the internal degrees of freedom to a complex subalgebra isomorphic to C\mathbb{C}C. Derivation of the Born Rule: We show that the Born rule (P=∣ψ∣2P = |\psi|^2P=∣ψ∣2) emerges as the unique, positive-definite inner product consistent with the internal Krein metric η\etaη after projecting out ghost-sector excitations. Algebraic Necessity of the Quadratic Form: The paper provides a rationale for the second-power dependence of probability, linking it to the conservation of the bilinear form under pseudo-unitary time evolution. By reframing standard QM as a low-energy manifestation of PQA geometry, this study provides a consistent "Why" for the mathematical structure of our quantum reality, suggesting that the "ghosts" of higher-derivative theories are the very keys to understanding the origin of quantum axioms.
This paper is the third installment (Part III) of a research series dedicated to the geometric and algebraic foundations of higher-derivative scalar theories. Following the structural uniqueness of the □2\Box^2□2 operator (Part I: arXiv:2512.16955) and the emergence of spin-analogous dynamics (Part II), this work addresses the most fundamental axioms of quantum mechanics (QM). Key findings presented in this manuscript: Geometric Origin of Complex Numbers: We demonstrate that the standard complex field C\mathbb{C}C of quantum mechanics is not a fundamental postulation but an emergent infrared (IR) feature. In the Split-Quaternionic Krein Algebra (PQA), the decoupling of heavy indefinite-metric modes at the Lee-Wick scale (M≈11.3M \approx 11.3M≈11.3 TeV) naturally reduces the internal degrees of freedom to a complex subalgebra isomorphic to C\mathbb{C}C. Derivation of the Born Rule: We show that the Born rule (P=∣ψ∣2P = |\psi|^2P=∣ψ∣2) emerges as the unique, positive-definite inner product consistent with the internal Krein metric η\etaη after projecting out ghost-sector excitations. Algebraic Necessity of the Quadratic Form: The paper provides a rationale for the second-power dependence of probability, linking it to the conservation of the bilinear form under pseudo-unitary time evolution. By reframing standard QM as a low-energy manifestation of PQA geometry, this study provides a consistent "Why" for the mathematical structure of our quantum reality, suggesting that the "ghosts" of higher-derivative theories are the very keys to understanding the origin of quantum axioms.
This paper is the third installment (Part III) of a research series dedicated to the geometric and algebraic foundations of higher-derivative scalar theories. Following the structural uniqueness of the □2\Box^2□2 operator (Part I: arXiv:2512.16955) and the emergence of spin-analogous dynamics (Part II), this work addresses the most fundamental axioms of quantum mechanics (QM). Key findings presented in this manuscript: Geometric Origin of Complex Numbers: We demonstrate that the standard complex field C\mathbb{C}C of quantum mechanics is not a fundamental postulation but an emergent infrared (IR) feature. In the Split-Quaternionic Krein Algebra (PQA), the decoupling of heavy indefinite-metric modes at the Lee-Wick scale (M≈11.3M \approx 11.3M≈11.3 TeV) naturally reduces the internal degrees of freedom to a complex subalgebra isomorphic to C\mathbb{C}C. Derivation of the Born Rule: We show that the Born rule (P=∣ψ∣2P = |\psi|^2P=∣ψ∣2) emerges as the unique, positive-definite inner product consistent with the internal Krein metric η\etaη after projecting out ghost-sector excitations. Algebraic Necessity of the Quadratic Form: The paper provides a rationale for the second-power dependence of probability, linking it to the conservation of the bilinear form under pseudo-unitary time evolution. By reframing standard QM as a low-energy manifestation of PQA geometry, this study provides a consistent "Why" for the mathematical structure of our quantum reality, suggesting that the "ghosts" of higher-derivative theories are the very keys to understanding the origin of quantum axioms.
This paper is the third installment (Part III) of a research series dedicated to the geometric and algebraic foundations of higher-derivative scalar theories. Following the structural uniqueness of the □2\Box^2□2 operator (Part I: arXiv:2512.16955) and the emergence of spin-analogous dynamics (Part II), this work addresses the most fundamental axioms of quantum mechanics (QM). Key findings presented in this manuscript: Geometric Origin of Complex Numbers: We demonstrate that the standard complex field C\mathbb{C}C of quantum mechanics is not a fundamental postulation but an emergent infrared (IR) feature. In the Split-Quaternionic Krein Algebra (PQA), the decoupling of heavy indefinite-metric modes at the Lee-Wick scale (M≈11.3M \approx 11.3M≈11.3 TeV) naturally reduces the internal degrees of freedom to a complex subalgebra isomorphic to C\mathbb{C}C. Derivation of the Born Rule: We show that the Born rule (P=∣ψ∣2P = |\psi|^2P=∣ψ∣2) emerges as the unique, positive-definite inner product consistent with the internal Krein metric η\etaη after projecting out ghost-sector excitations. Algebraic Necessity of the Quadratic Form: The paper provides a rationale for the second-power dependence of probability, linking it to the conservation of the bilinear form under pseudo-unitary time evolution. By reframing standard QM as a low-energy manifestation of PQA geometry, this study provides a consistent "Why" for the mathematical structure of our quantum reality, suggesting that the "ghosts" of higher-derivative theories are the very keys to understanding the origin of quantum axioms.
This paper proves that quantum mechanics emerges as a mathematical necessity when a deterministic classical system possesses compact Kähler dimensions inaccessible to observation. The proof rests on three independent results from established mathematics: Spectral discreteness: The spectral theorem for elliptic operators on compact manifolds guarantees a discrete eigenspectrum, producing superposition and complex phase structure. The uncertainty principle: The Gromov non-squeezing theorem establishes an irreducible lower bound on observable uncertainties, with Planck's constant identified as the symplectic capacity of the compact space. The Born rule: The unique Kähler-compatible L² inner product determines the probability rule P = |ψ|² with no alternatives. Together, these results demonstrate that the complete axiomatic structure of quantum mechanics — complex Hilbert space, superposition, interference, the uncertainty principle, the Born rule, and entanglement — is a necessary consequence of dimensional projection rather than a set of independent postulates. The paper further shows that: The complex numbers in quantum mechanics originate from the complex structure (J) of the compact manifold, providing a geometric explanation for recent experiments ruling out real-valued quantum mechanics (Renou et al., Nature 2021; Chen et al., PRL 2022). Unitary time evolution arises because the complex structure converts what would otherwise be dissipative dynamics into probability-preserving oscillation. The number field of quantum mechanics (real, complex, or quaternionic) is determined by the topology of the compact dimensions (Riemannian, Kähler, or hyperkähler respectively), making laboratory quantum experiments probes of extra-dimensional geometry. CPT symmetry corresponds to orientation-invariance of the compact manifold, connecting discrete symmetry tests to the topology of the extra dimensions. The theorem requires no physical assumptions beyond the existence of inaccessible compact Kähler dimensions. It applies to any number of dimensions, any compact Kähler geometry, and any deterministic dynamics. The paper concludes that quantum mechanics is not a law of nature but a law of perspective — the second such law in physics, following relativity. Where relativity revealed that the separation of spacetime into space and time is observer-dependent, this work shows that the separation of dynamics into deterministic and probabilistic is equally observer-dependent. Originally submitted to Foundations of Physics on March 16, 2026
Abstract The Born rule, which assigns probabilities as squared amplitudes, is traditionally introduced as an independent postulate of quantum mechanics. In this work, we demonstrate that the quadratic structure of probability is instead a geometric necessity. Within a multi-channel phase algebra admitting a spectral decomposition, measurement is identified as a projection onto a single stable sector of an underlying linear state space. The norm is not postulated independently; its quadratic form is forced by the requirement that measurement produce a positive, phase-insensitive scalar while discarding unobservable phase information. Probability thus emerges as the squared norm preserved under projection, rather than as an additional axiom. In this perspective, the Born rule is revealed as a direct consequence of phase geometry and measurement stability, grounded in the geometric structure of the state space itself.
Paper 102 of the SDRIS Research Series Following the geometric derivation of forces (Paper 100) and non-locality (Paper 101), this work addresses the origin of quantum probability. Abstract: The Born Rule, which states that the probability of a quantum measurement is proportional to the square of the wavefunction's amplitude (P=∣ψ∣2P = |\psi|^2P=∣ψ∣2), is one of the most fundamental yet least understood axioms of quantum mechanics. Standard theory treats it as an empirical postulate without a rigorous geometric derivation. In this paper, we derive the Born Rule as a necessary consequence of the Static-Dynamic Recursive Information Space (SDRIS) framework. We demonstrate that the "amplitude" ∣ψ∣|\psi|∣ψ∣ corresponds to the linear Euclidean length of the information vector in the 5-dimensional bulk, while the "probability" PPP corresponds to the interaction flux through the 3-dimensional projection interface. Since the information flux through a holographic boundary scales with the surface area (A∝r2A \propto r^2A∝r2) rather than the linear radius, the quadratic relationship is geometrically inevitable. Furthermore, we show that Wave-Particle Duality is resolved as an observational artifact: The "Wave" is the continuous rotation of the vector in the recursive time dimension (τ\tauτ), while the "Particle" is the discrete intersection of this vector with the static metric slice (ttt). Thus, quantum randomness is identified not as intrinsic indeterminism, but as the geometric cross-section of a higher-dimensional determinism. Includes Computational Verification: This publication includes a Python simulation (SDRIS_Born_Rule_Simulation_Code_v1.0.ipynb) that numerically validates the flux-projection mechanism, confirming that the measurement of a deterministic 5D-vector yields a statistical distribution strictly following the Born Rule.