In this work, we introduce a novel framework for quantum dynamics based on a second-order evolution equation, ∂2/∂t2∣Ψ⟩=K∣Ψ⟩ , with K=i(αD+βV) , where the operators D and V satisfy the Heisenberg algebra [D,V]=dI in d -dimensional space. Unlike conventional quantum mechanics governed by the first-order Schrödinger equation, this formulation emerges from a unified dynamical structure rooted in phase-space symmetry, naturally accommodating non-Hermitian interactions while preserving unitary evolution through the introduction of an η -inner product and a dual-state mapping. We demonstrate that this theory shares an SL(2,R) symmetry with the standard quantum formalism, revealing that both the Schrödinger and our second-order dynamics arise as distinct realizations within the same symplectic framework — the former as a quadratic generator (energy conservation), the latter as a linear generator (driving-dissipation balance). Extending the theory to four dimensions via Dirac matrices yields a covariant, spinor-valued wave equation whose stationary solutions carry instanton topological charge, π3(S3)=Z , thereby unifying the topological structures from one to four spatial dimensions under the homotopy classification πd−1(Sd−1)=Z . This approach not only generalizes non-Hermitian quantum mechanics beyond PT -symmetric potentials but also establishes a direct bridge between quantum dynamics, symplectic geometry, and topological field theory.
In this work, we introduce a novel framework for quantum dynamics based on a second-order evolution equation, ∂2/∂t2∣Ψ⟩=K∣Ψ⟩ , with K=i(αD+βV) , where the operators D and V satisfy the Heisenberg algebra [D,V]=dI in d -dimensional space. Unlike conventional quantum mechanics governed by the first-order Schrödinger equation, this formulation emerges from a unified dynamical structure rooted in phase-space symmetry, naturally accommodating non-Hermitian interactions while preserving unitary evolution through the introduction of an η -inner product and a dual-state mapping. We demonstrate that this theory shares an SL(2,R) symmetry with the standard quantum formalism, revealing that both the Schrödinger and our second-order dynamics arise as distinct realizations within the same symplectic framework — the former as a quadratic generator (energy conservation), the latter as a linear generator (driving-dissipation balance). Extending the theory to four dimensions via Dirac matrices yields a covariant, spinor-valued wave equation whose stationary solutions carry instanton topological charge, π3(S3)=Z , thereby unifying the topological structures from one to four spatial dimensions under the homotopy classification πd−1(Sd−1)=Z . This approach not only generalizes non-Hermitian quantum mechanics beyond PT -symmetric potentials but also establishes a direct bridge between quantum dynamics, symplectic geometry, and topological field theory.
We extend the framework of Unified Quantum Mechanics (UQM) to the relativistic domain by formulating the Dirac equation entirely in terms of real-valued fields. In this approach, the complex imaginary unit i is systematically replaced by the temporal Hilbert transform operator Ht, which satisfies the anti-involution property Ht2=−I and acts as a dimensionless isometric operator. The resulting theory is expressed as a coupled system of real-valued equations for a primary field ψ and its Hilbert-transformed partner ϕ=Ht[ψ], whose evolution is governed exclusively by local differential operators. We demonstrate that all essential algebraic and symmetry structures of relativistic quantum mechanics are preserved within this real-valued formulation. In particular, the full Clifford algebra of the Dirac matrices, Lorentz covariance, and the relativistic energy-momentum relation are recovered exactly. A rigorous isomorphism with the conventional complex Dirac equation is established via the analytic signal representation ψa=ψ−iϕ, under which the standard U(1) gauge symmetry emerges naturally as a global SO(2) rotation in the real field space. The resulting formulation is therefore operationally and predictively equivalent to the standard complex theory. The conserved scalar density ρ=ψ†ψ+ϕ†ϕ=∣ψa∣2 is shown to arise as the squared envelope (intensity) of a real physical field and admits a direct interpretation as a local field intensity with well-defined physical dimensions. Probability conservation is recovered through the continuity equation, while normalization in standard quantum mechanics is reinterpreted as a rescaling by the conserved total field. Stability of matter, expressed as energy positivity, is shown to restrict the physical solution space to analytic signals, enforcing a Hilbert-pair structure and eliminating independent complex degrees of freedom. This work demonstrates that the complex structure of relativistic quantum mechanics is not fundamental but emerges from the analytically constrained dynamics of real-valued fields, providing a unified and physically transparent foundation for the Dirac theory.
The symmetry properties of quantum variational principles are considered. Euler-Poincaré reduction theory is applied to the Dirac-Frenkel variational principle for Schrödinger's dynamics producing new variational principles for the different pictures of quantum mechanics (Schrödinger's, Heisenberg's and Dirac's) as well as for the Wigner-Moyal formulation. In addition, new variational principles for mixed states dynamics have been formulated. The already known geometric characterization of quantum mechanics on the complex projective space is shown to emerge naturally from the Euler-Poincaré variational principle. Semidirect-product structures are seen to produce new variational principles for Dirac's picture. \n \nOn the other hand, the variational and Hamiltonian approach to Ehrenfest expectation values dynamics is proposed. In the Lagrangian framework, the quantum variational principle for Schrödinger's dynamics is extended to account for both classical and quantum degrees of freedom. First, it is shown that the mean field model of any quantum mechanical system can be derived from a classical-quantum Euler-Poincaré Lagrangian on the direct sum Lie algebra of the Heisenberg and unitary groups. Then, the semidirect-product structure (named Ehrenfest group), is constructed using the displacement operator from the theory of coherent quantum states ( the unitary action of the Heisenberg group on the space of wavefunctions). New classical-quantum equations for Ehrenfest's expectation values dynamics are derived redefining the mean-field model Euler-Poincaré Lagrangian on the Lie algebra of the Ehrenfest group. In the Hamiltonian framework, first expectation values of the canonical observables are shown to be equivariant momentum maps for the unitary action of the Heisenberg group on quantum states. Then, the Hamiltonian structure for Ehrenfest's dynamics is shown to be Lie-Poisson for the Ehrenfest group. The variational formulation is then given a corresponding Hamiltonian structure. The classical-quantum Ehrenfest dynamics equations produce classical and quantum dynamics as special limit cases. \n \nIn the particular case of Gaussian states, expectation values couple to second order moments, so that GS are completely characterized by first and second moments. When the total energy is computed with respect to a Gaussian state, higher moments can be expressed in terms of the first two, so that the moment hierarchy closes for Gaussian states. Second moments are shown to be equivariant momentum maps for the action of the symplectic group on the space of Wigner functions. Eventually, Gaussian states are shown to possess a Lie-Poisson structure on the Jacobi group. This structure produces an energy-conserving variant of a class of Gaussian moment models that have appeared in the chemical physics literature.
Overview In the centennial year of the Schrödinger Equation (1926–2026), this work introduces a novel conceptual framework where quantum dynamics emerges from the intrinsic topological properties of a discrete, non-orientable space-time lattice. The core of the model is the "Möbius Pixel": a fundamental 0D/0+1D quantum unit defined on a non-orientable manifold. By employing the formalism of Pseudo-Hermitian Quantum Mechanics, we demonstrate how the antilinear symmetries inherent in surfaces like the Möbius strip and the Klein bottle naturally generate real energy spectra and complex dynamical structures. Key Scientific Contributions Emergent Dynamics: Derivation of a modified Schrödinger equation from a discrete pixel lattice (pi, pi*), featuring emergent Dirac and Majorana-type coupling terms. Topological Foundation: A rigorous link between non-orientable geometry and the Nambu-like doubled representation of quantum states. Pseudo-Hermiticity: Use of the metric operator η and the involutory operator C to ensure spectral stability and positive-definite inner products in the presence of torsional couplings. Unified Vision: A "symphonic" perspective where fundamental interactions and mass are interpreted as rotovibrational resonances and topological inertia of the lattice. Technical Abstract We construct a toy-model framework in which quantum dynamics emerges from the topological structure of non-orientable surfaces. Using a discrete pixel lattice, we derive a pseudo-Hermitian Hamiltonian whose continuum limit reproduces a Schrödinger equation with additional Dirac and Majorana-type terms. The reality of the spectrum is guaranteed by the pseudo-Hermiticity condition. In this framework, the observable wavefunction emerges as an energy-resolved sector of a higher-dimensional pseudo-Hermitian system. Technical Focus: Pseudo-Hermitian Stability and Lagrangian Spectrum This framework is centered on the formalization of a stable, real-valued spectrum for non-orientable pixel dynamics. The core mathematical challenge addressed is the preservation of a positive-definite inner product in the presence of torsional (antilinear) terms. 1. The Metric Operator η and Involutory C To ensure spectral stability, we define the Hamiltonian H as pseudo-Hermitian with respect to the metric operator η: H† = η H η⁻¹ We introduce a linear, involutory operator C (C² = I) that commutes with the Hamiltonian [H, C] = 0. This operator C is essential for constructing a strictly positive-definite inner product: ⟨ψ | φ⟩_C = ⟨ψ | η C | φ⟩ This construction guarantees that the "Möbius Pixel" states reside in a physical Hilbert space with a consistent probabilistic interpretation, neutralizing the instabilities typically associated with non-Hermitian torsional couplings. 2. Lagrangian Extension and Hamiltonian H The internal dynamics is derived from a 0+1D Lagrangian density accounting for vibrational (n) and topological (k) degrees of freedom. The extension to the full Hamiltonian H includes: Mass-topological Term: m_top c² Internal Excitation Spectrum: Defined by the functional f(n,k), representing the energy levels of the discrete pixel. Torsional Coupling: An antilinear term λ₄ Φ T inducing mixing between the pi and pi* sectors. The resulting spectrum E_n,k remains real under the stability condition: (m_top c² + λ₃ f(n,k))² ≥ (λ₄ Φ_k)² This inequality provides a natural threshold for the lattice, where Planck-scale incompressibility acts as a physical cut-off. Call for Formalization and Collaboration I have established the foundational structure for η and C within the context of the C-formalization. I am looking for collaborators (Theoretical Physicists, Mathematicians) to: Generalize the C operator for an N-pixel lattice interaction. Refine the Lagrangian to include full Lorentz invariance in the continuum limit. Analyze Torsional Modes as symmetry-protected sectors in a 4D pseudo-Hermitian field theory.
This work reformulates quantum mechanics on the real plane (R2), establishing an algebraic isomorphism to the complex field (C) and demonstrating that the complex structure inherent to the Schrödinger equation can be fully captured by coupled real-valued dynamics. By constructing a field (R2,+,⋅) isomorphic to C, the real counterpart of the Schrödinger equation is derived, yielding a system of coupled real partial differential equations. This system reveals a symplectic structure where the symplectic matrix J geometrically represents the imaginary unit i, acting as a phase-space rotation operator. Time-independent solutions decouple into identical real Helmholtz equations, preserving spectral equivalence. The reformulation provides geometric insights into foundational aspects: the geometric representation of i, the emergence of probability conservation from real-component interactions, and the encoding of quantum phase relationships through the multiplicative structure of the R2 field. This perspective reinforces connections to classical Hamiltonian mechanics and geometric quantization, suggesting that complex numbers are structural, emerging from field operations on the real plane, rather than fundamental. Furthermore, quantum computation elements like qubits and gates are shown to have equivalent representations as real symplectic and special orthogonal matrices, maintaining unitary equivalence. We introduce a framework for quantum computation within a real vector space and provide a generalized protocol for generating entangled Bell states. These results offer a new perspective on the necessity of complex numbers in quantum theory, providing a framework with potential computational advantages for hybrid quantum-classical systems and enhanced geometric interpretability.
This work resolves a foundational tension in Dirac's formulation of relativistic quantum mechanics: momentum appears in two distinct but undifferentiated roles—as a dispersion-locked parameter generating unitary evolution in the relativistic wave equation, and as a free phase variable subject to symplectic flow in the constraint formalism. We demonstrate that this duality reflects an intrinsic Lorentzian structure in energy-momentum space, characterized by the interval dΣ² = dE²/c² − dp². This geometry divides naturally into three sectors: symmetric (dispersion-locked), null (massless, E/|p| = c), and antisymmetric (free-momentum) regimes, each governed by different geometric constraints. Dispersion emerges as the global integral of an exact action one-form, while the (E,p) symplectic structure arises locally as the exterior derivative of the action's inexact form θ_E = E dp. Energy quantization appears as a topological stability condition requiring closed spectral loops to satisfy ∮ E dp = nh, defining "proto-eigenstates" whose Fourier encodings yield standard Hilbert-space eigenstates. We recover both the Bohr spectrum and Dirac fine-structure energies from spectral phase closure, revealing α = e²/(ℏc) as a geometric action-normalization ratio between Maxwell U(1) curvature and Lorentz spinor action—not a coupling parameter from QED perturbation theory. The framework synthesizes unitary flow and symplectic uncertainty into a single bilinear Lorentzian structure, showing quantum states as objective in their symmetric unitary existence but path-dependent in their antisymmetric observed manifestation. This geometric reconstruction bridges Dirac's wave mechanics and constraint formalism through native (E,p) phase space, offering a foundation for quantum theory that treats energy-momentum as primary coordinates rather than conjugate variables derived from spacetime position.
We formulate a second-order organization of quantum dynamics in which physical energy is identified with the magnitude of the temporal oscillation frequency, whereas the algebraic sign of the frequency specifies temporal phase orientation rather than the sign of energy. For any time-independent self-adjoint first-order evolution generator G^, the associated second-order parent wave equation naturally defines a nonnegative physical-energy operator through the spectral modulus E^pe=∣G^∣=G^2. Through the polar decomposition G^=S^E^pe, this construction decouples the nonnegative physical-energy magnitude from the signed spectrum of the first-order generator. Applied to the free Dirac equation, the Dirac Hamiltonian H^D retains its conventional unbounded spectrum (−∞,−mc2]∪[mc2,∞), whereas the physical-energy spectrum is bounded below by the rest energy, σ(E^pe)=[mc2,∞). For generators with a spectral gap around zero, the second-order dynamics admits a positive-definite conserved wave norm and an equivalent two-component unitary evolution. We further prove a positive-frequency spectral completeness theorem in L2(R) and show that the temporal Hilbert transform Ht provides a natural real-linear operator realization of the modulus mapping via ℏHt∂t↔ℏ∣Ω∣. Direct numerical diagonalization and high-precision time-domain integration of the one-dimensional Dirac equation confirm both the spectral modulus mapping and the exact conservation of quadratic wave energy across opposite temporal orientations. While this kinematic framework places quantum energy on the same nonnegative footing as classical field and signal energies, promoting the two temporal orientations to full particle and antiparticle sectors requires a second-quantized field theory incorporating charge conjugation, spin-statistics, locality, and interactions.