We present a three-level organization of a bilocal relational theory inwhich structures usually associated with quantum mechanics arise atlogically distinct stages. The first level is purely geometric. Starting from the bilocalconfiguration space \(M\times M\) and its canonical cotangent bundle,the relative sector admits a radial--angular decomposition. For \(N=3\),the angular phase space is \(T^*S^2\). Its non-singular sector isnaturally organized as\(\mathbb R_+\times SO(3)\) and therefore possesses the canonical doublecover\[\mathbb R_+\times SU(2)\simeq\mathbb C^2\setminus\{0\}.\] A classical two-component \(SU(2)\)-spinorial carrier thus appearsbefore any Lorentzian dynamics or quantum postulate; its identificationwith a Lorentz-covariant Weyl spinor is not assumed at this stage.Reduction at fixed internalCasimir yields the Hopf fibration with \(|c_1|=1\). For \(N=3\), defining\(p_\mu=(p_t,\mathbf P)\) and\(\mu_{\rm int}=\kappa_1+i\kappa_2\)rewrites the full constraint as\[p_\mu p^\mu+|\mu_{\rm int}|^2=0.\]Its Clifford factorization then admits an exact chiral first-order formwith a two-dimensional complex kernel. At this stage the constructionremains classical: the momenta are phase-space variables and the kernelspinor is not yet a quantum wave function.The third level promotes this geometric and dynamical structure toquantum spinor dynamics. Geometry supplies an integer topological classbut not a universal scale of action; the identification\(I=n\hbar/2\) therefore requires the quantum scale \(\hbar\).Together with the operator rule\(p_\mu\mapsto-i\hbar D_\mu\), the classical chiral factorization becomesa quantum Dirac-type equation. If the internal complex contributionadmits a sector or limit in which it reduces to a real constant\(m\), the standard massive Dirac equation\[(i\hbar\gamma^\mu D_\mu-m)\Psi_D=0\]is recovered. The construction therefore separates three ingredients that arenormally introduced together: spinorial and topological statestructure, Lorentzian dynamics, and quantum operator dynamics. We donot derive quantum mechanics from classical geometry. Rather, we showthat the spinorial carrier and the algebraic architecture of the Diracequation can arise before quantization, while the quantum scale andoperator realization remain independent inputs. This identifiesprecisely which elements of quantum spinor dynamics are geometric,which depend on the Lorentzian dynamical postulate, and which remaingenuinely quantum assumptions.
We present a three-level organization of a bilocal relational theory inwhich structures usually associated with quantum mechanics arise atlogically distinct stages. The first level is purely geometric. Starting from the bilocalconfiguration space (M\times M) and its canonical cotangent bundle,the relative sector admits a radial--angular decomposition. For (N=3),the angular phase space is (T^*S^2). Its non-singular sector isnaturally organized as(\mathbb R_+\times SO(3)) and therefore possesses the canonical doublecover[\mathbb R_+\times SU(2)\simeq\mathbb C^2\setminus{0}.] A classical two-component (SU(2))-spinorial carrier thus appearsbefore any Lorentzian dynamics or quantum postulate; its identificationwith a Lorentz-covariant Weyl spinor is not assumed at this stage.Reduction at fixed internalCasimir yields the Hopf fibration with (|c_1|=1). For (N=3), defining(p_\mu=(p_t,\mathbf P)) and(\mu_{\rm int}=\kappa_1+i\kappa_2)rewrites the full constraint as[p_\mu p^\mu+|\mu_{\rm int}|^2=0.]Its Clifford factorization then admits an exact chiral first-order formwith a two-dimensional complex kernel. At this stage the constructionremains classical: the momenta are phase-space variables and the kernelspinor is not yet a quantum wave function.The third level promotes this geometric and dynamical structure toquantum spinor dynamics. Geometry supplies an integer topological classbut not a universal scale of action; the identification(I=n\hbar/2) therefore requires the quantum scale (\hbar).Together with the operator rule(p_\mu\mapsto-i\hbar D_\mu), the classical chiral factorization becomesa quantum Dirac-type equation. If the internal complex contributionadmits a sector or limit in which it reduces to a real constant(m), the standard massive Dirac equation[(i\hbar\gamma^\mu D_\mu-m)\Psi_D=0]is recovered. The construction therefore separates three ingredients that arenormally introduced together: spinorial and topological statestructure, Lorentzian dynamics, and quantum operator dynamics. We donot derive quantum mechanics from classical geometry. Rather, we showthat the spinorial carrier and the algebraic architecture of the Diracequation can arise before quantization, while the quantum scale andoperator realization remain independent inputs. This identifiesprecisely which elements of quantum spinor dynamics are geometric,which depend on the Lorentzian dynamical postulate, and which remaingenuinely quantum assumptions.
Spinor structure is usually introduced as part of relativistic quantum theory. We show that its underlying algebra can instead emerge without quantisation from a covariant statistical description of a massive relativistic particle subject to an explicit finite-dimensional linear factorisation of the complete massive mass-shell constraint motivated by requiring the theory retain both sheets of the massive mass shell. A finite-dimensional factorisation of the complete mass-shell constraint, linear in all four momentum components, forces a Clifford algebra. In (3+1) dimensions its minimal complex representation is four-dimensional, while each on-shell factor selects a rank-two sector; in this representation statistical completeness requires an arbitrary 2×2 matrix distribution within that sector before quantisation. Projecting the Weyl-ordered matrix Liouvillian gives relativistic transport while preserving all internal populations and coherences. For universal deformations on flat canonical phase space satisfying the stated covariance, matrix-neutrality, homogeneity and associativity assumptions, the resulting product is the matrix Weyl--Moyal product. Its parameter has dimensions of action and, when identified with ℏ, supplies the scale of physical spin-21. Requiring all-order constraint preservation gives a vanishing star commutator, while preservation of the selected star-spectral sector yields the two-sided Dirac--Wigner equations. Our central conclusion is therefore that relativistic mass-shell factorisation supplies spinor structure, while completion of the constraint-preservation hierarchy within the stated deformation class leads to the Weyl--Moyal phase-space formulation of quantum mechanics.
Abstract This paper is the third part of the third volume of the Back-Particle Theory. Building upon the dynamic intrinsic displacements, unified wave equation, and emergence of electromagnetic potentials established in Parts I and II of Volume 3, it systematically completes the geometric interpretation of quantum behavior, the emergent derivation of relativistic structure, and the geometric construction of the Dirac equation. Starting from the enormous degrees of freedom (∼ 10¹⁰⁴) of the back-particle array and its deterministic chaos, we demonstrate that quantum probability is not a fundamental postulate but an inevitable result of finite-information coarse-grained descriptions of the array’s chaotic dynamics, with the Born rule P = |ψ|² interpreted as a statistical expression of the excitation weights of specific vibration modes of the array. Through canonical quantization of the array displacement field, we rigorously derive the uncertainty principle Δx Δp ≥ ℏ_eff/2 and the zero-point fluctuation formula, and derive the decoherence rate Γ_dec ∼ (Θ_env/ℏ_eff)(Δr/d₀)² from the system-environment coupling model. Furthermore, starting from the homogeneous wave equation of the free array and requiring its form invariance under inertial frame transformations, we rigorously derive the Lorentz transformation, proving that the space-time structure of special relativity is a natural emergence of the array’s wave geometry. Based on the second-order classical dynamical equation of intrinsic displacements, we rigorously derive the Dirac equation through operator factorization by introducing the Clifford algebra γ^μ, where the spinor field Ψ is constructed from the intrinsic displacements (d_A, d_f) via symmetry mapping, the mass term ω₀/c originates from the array’s restoration frequency, the spin operator satisfies the SU(2) algebra, and spin 1/2 emerges naturally from the quantization of intrinsic angular momentum. All derivations strictly follow the principles of causal unidirectionality, field superposition, dimensional purity, and parameter emergence, with all parameters emerging in a closed manner from the basic set {A, F, f, f_ext, ρ₀, c} and the lattice geometric factors, achieving a complete logical closed loop from classical array dynamics to quantum mechanics. Keywords: Back-Particle; Emergence of Quantum Probability; Born Rule; Uncertainty Principle; Decoherence; Lorentz Transformation; Dirac Equation; Spinor Field; Spin 1/2; Clifford Algebra; Geometric Quantum Mechanics
This work develops a relational helical formulation of quantum mechanics in which the complex structure of the wavefunction acquires a concrete geometric interpretation. The imaginary unit i is identified as the generator of helical transport across a foliation of discrete hypersurfaces, transforming quantum phase into an angular coordinate and amplitude into a radial coordinate on a logarithmic spiral. Within this framework, standard quantum mechanics emerges as the projection of a deeper helical symmetry, revealing that its complex structure already encodes an intrinsic relativistic geometry. Building on this foundation, the construction incorporates a spiral mass equation, a modified ER-analogue metric, and a hypersurface-discrete spacetime, yielding a relational Hilbert- bundle structure governed by a least-action principle defined between layers. The resulting dual gravitational system, combining geometric (spiral) and energetic (mass/curvature) components, introduces canonical variables such as the spiral pitch a(λ) and the helical connection A(λ,x), each admitting well-defined conjugate momenta. These variables satisfy canonical commutation relations and form the operator algebra required for a quantum-gravity-like dynamics. The string-length postulate, identifying hypersurface circumferences as fundamental geometric quanta, further discretizes the underlying geometry. Together, these elements constitute a coherent proto-quantum-gravity framework in which the conceptual tension between quantum mechanics and relativity is dissolved, and the quantization of geometric degrees of freedom arises organically from the relational helical structure.
This paper derives the Dirac equation as the logically forced relativistic completion of the de Broglie wave dynamics established in prior work of this series. Starting from the logical foundation that yields Lorentz/Poincaré invariance, we promote the non-relativistic framework (continuous spacetime, Fourier duality, local plane-wave structures, and probability conservation via statistical energy flux) to the relativistic regime. We show that the requirements of exact local relativistic plane-wave structures (with phase gradients satisfying the mass-shell condition pμpμ=m2c2), first-order time evolution (needed for clean probability conservation), and full Lorentz covariance together force the introduction of a specific non-commuting algebraic structure and a multi-component wave function. The Dirac equation emerges as the unique linear differential operator of order at most one in the spacetime derivatives that consistently glues these local structures across smooth backgrounds while preserving a conserved four-current with positive-definite time component. This multi-component structure arises naturally as the minimal algebraic consequence of the constraints, without any separate postulate for intrinsic angular momentum. In exact analogy with the emergence of the finite invariant causal speed in special relativity, the Dirac dynamics is revealed not as an ad-hoc linearization of the Klein--Gordon equation, but as the mathematically inevitable description of indivisible particles in continuous relativistic spacetime. The derivation thereby completes the single-particle sector of the series, demonstrating that core structures of relativistic quantum mechanics flow deductively from a small number of deep, nearly tautological commitments.
This work derives the fundamental framework of quantum mechanics intrinsically from the first-principle axioms of UD duality theory. Starting from the inherent binary expansive–condensative attributes of the UD ontology, four fundamental physical fields are naturally decomposed by spontaneous symmetry breaking across spatial and material existential domains. A two-component complex spinor structure is uniquely constructed, and the imaginary unit i is proven to be not merely a mathematical convention but a structurally necessary ingredient required by both the compact SU(2) symmetry and the orthogonal inter-containment of U and D attributes. Within the flat spacetime limit of the UD gravitational action, a system of coupled Klein–Gordon field equations is established, governed by a single self-consistent fundamental mass scale m₀=1/(2πe^π) with no adjustable free parameters. The coupling constant is determined analytically from the UD vacuum equilibrium background values and the U↔D duality symmetry. Through explicit construction of four-component Dirac spinors and auxiliary field decomposition, the on-shell equivalence between the UD coupled field equations and the free Dirac equation is rigorously demonstrated. The non-relativistic limit further recovers the Pauli equation and the Schrödinger equation sequentially, reconstructing the core dynamical equations of quantum mechanics from a unified foundational origin. Global U(1) phase invariance of the UD action is verified via total-derivative decomposition, yielding the standard Noether conserved current. The Born probability interpretation is deduced directly from the global normalization axiom by isolating localized laboratory-scale excitations from the cosmic background, eliminating the need for independent quantum postulates. Based on the intrinsic properties of the UD field components, a self-consistent ontological interpretation is provided for wave–particle duality, double-slit interference, and the quantum measurement problem. In this framework, the measurement problem is dissolved rather than solved: no collapse postulate is required, and determinism is restored at the ontological level. The theory naturally implies that the continuous D_U field permits quantum superposition, while condensed D_D intrinsic entities possess definite classicality without physical particle-state superposition. Three testable theoretical predictions are presented, establishing falsifiable physical consequences of the UD quantum formulation. This paper completes the intrinsic derivation of the foundational structure of quantum mechanics from UD theory. Together with the previously derived general relativity framework, it realizes the homologous unification of gravity and quantum mechanics within a single self-contained axiomatic system.
Previous works have shown that bilocal constraint geometry naturally gives rise to twodistinct geometric structures.The radial sector generates a distinguished one-dimensional characteristic flowinterpreted as relational time, whereas the angular sector reduces to a symplecticorbit carrying an internal Hamiltonian symmetry. The present work investigates the next natural step of this construction.Instead of interpreting the reduced orbit merely as a classical internal state space,we propose that it should be regarded as the classical precursor of a quantum statespace. Starting from the reduced symplectic orbit obtained by presymplectic reduction,we show that its geometric quantization naturally leads to a Hilbert space associatedwith every bilocal relation.After localization over spacetime, these Hilbert spaces form a bundle of quantumstates whose sections play the role of wave functions. Within this framework, neither time, gauge fields, nor Hilbert space are introducedas fundamental structures.All three emerge from the geometry of bilocal constraint orbits through differentstages of the same relational construction.