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arXiv:1105.3604 · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields

Six-dimensional space-time from quaternionic quantum mechanics

Dorje C. Brody, Eva-Maria Graefe

Published Dec 14, 2011• 29 citations
arXivHTMLPDF

Abstract

Quaternionic quantum Hamiltonians describing nonrelativistic spin particles require the ambient physical space to have five dimensions. The quantum dynamics of a spin-$\frac{1}{2}$ particle system characterized by a generic Hamiltonian is worked out in detail. It is shown that there exists, within the structure of quaternionic quantum mechanics, a canonical reduction to three spatial dimensions upon which standard quantum theory is retrieved. In this dimensional reduction, three of the five dynamical variables are shown to oscillate around a cylinder, thus behaving in a quasi-one-dimensional manner at large distances. An analogous mechanism is shown to exist in the case of octavic Hamiltonians, where the ambient physical space has nine dimensions. Possible experimental tests in search for the signature of extra dimensions at low energies are briefly discussed.

DOI
10.1103/physrevd.84.125016

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Quaternionic quantum Hamiltonians describing nonrelativistic spin particles require the ambient physical space to have five dimensions. The quantum dynamics of a spin-12\frac{1}{2}21​ particle system characterized by a generic Hamiltonian is worked out in detail. It is shown that there exists, within the structure of quaternionic quantum mechanics, a canonical reduction to three spatial dimensions upon which standard quantum theory is retrieved. In this dimensional reduction, three of the five dynamical variables are shown to oscillate around a cylinder, thus behaving in a quasi-one-dimensional manner at large distances. An analogous mechanism is shown to exist in the case of octavic Hamiltonians, where the ambient physical space has nine dimensions. Possible experimental tests in search for the signature of extra dimensions at low energies are briefly discussed.
While real Hamiltonian mechanics and Hermitian quantum mechanics can both be cast in the framework of complex canonical equations, their complex generalizations have hitherto remained tangential. In this communication, quaternionic and coquaternionic (split-signature analogue of quaternions) extensions of Hamiltonian mechanics are introduced and are shown to offer a unifying framework for complexified classical and quantum mechanics. In particular, quantum theories characterized by complex Hamiltonians invariant under spacetime reflection are shown to be equivalent to certain coquaternionic extensions of Hermitian quantum theories. One of the interesting consequences is that the spacetime dimension of these systems is six, not four, on account of the structures of coquaternionic quantum mechanics.
Extra dimensions are introduced: 3 in Classical Mechanics and 6 in Relativistic Mechanics, which represent orientations, resulting from rotations, of a particle, described by quaternions, and leading to a 7-dimensional, respectively 10-dimensional, world. The concept of spin is thus defined in both cases, which results to be different from angular momentum. It leads to the known concept of Quantum Mechanical spin in both cases. In particular, application of these new ideas to (Relativistic) Quantum Mechanics, leads to quantization of energy levels in free electrons, which could be in principle detectable via their spectrum, confirming the theory.
A novel theory is outlined for describing the dynamics of relativistic electrons and positrons.By introducing the Lorentz-invariant universal time as a fifth independent variable, the Hamilton-Jacobi formalism of classical mechanics is extended from three to four spatial dimensions.This approach allows one to incorporate gravitation and spin interactions in the extended fivedimensional Lagrangian in a covariant form.The universal time has the function of a hidden Bell parameter.By employing the method of variation with respect to the four coordinates of the particle and the components of the electromagnetic field, the path equation and the electromagnetic field produced by the charge and the spin of the moving particle are derived.In addition the covariant equations for the dynamics of the components of the spin tensor are obtained.These equations can be transformed to the familiar BMT equation in the case of homogeneous electromagnetic fields.The quantization of the five-dimensional Hamilton-Jacobi equation yields a five-dimensional spinor wave equation, which degenerates to the Dirac equation in the stationary case if we neglect gravitation.The quantity which corresponds to the probability density of standard quantum mechanics is the four-dimensional mass density which has a real physical meaning.By means of the Green method the wave equation is transformed into an integral equation enabling a covariant relativistic path integral formulation.Using this approach a very accurate approximation for the four-dimensional propagator is derived.The proposed formalism makes Dirac's hole theory obsolete and can readily be extended to many particles.
Abstract We revisit the formulation of quantum mechanics over the quaternions and investigate the dynamical structure within this framework. Similar to standard complex quantum mechanics, time evolution is then mediated by a unitary operator which can be written as the exponential of the generator of time shifts. By imposing physical assumptions on the correspondence between the energy observable and the generator of time shifts, we prove that quaternionic quantum theory admits a time evolution only for systems with a quaternionic dimension of at most two. Applying the same strategy to standard complex quantum theory, we reproduce that the correspondence dictated by the Schrödinger equation is the only possible choice, up to a shift of the global phase.
This study presents a theory with a six-dimensional space-time structure, R^6, in order to describe quantum mechanic phenomena, the time arrow and quantum gravity. The interpretation of quantum world phenomena using four-dimensional space-time would be a very complicated and indescribable task. The dual wave-particle behavior, entanglement, quantum corridors, etc., represent the complex space-time structure. Previous studies indicate that complicated behaviors of particles in quantum mechanics are basically considered as the inherent behavior of those particles. The theoretical framework of the balance is the transformation of imaginary dimensions into geometric dimensions and the description of quantum mechanical phenomena using external Euclidean geometry. The six-dimensional space-time structure consists of three space and three time dimensions and the time arrow is the result of the impossibility of the existence of matter in six space-time dimensions, and the direction of the arrow is aligned with the expansion of the universe.
We demonstrate that quantum mechanics emerges naturally from the five-dimensional hydrodynamic spacetime framework. The central insight is that quantum probability arises not from fundamental indeterminacy but from observers' confinement to three spatial dimensions. An observer measuring a particle's position integrates over all possible values of the fourth spatial coordinate w (the time density dimension), creating an apparent probability distribution even for particles with definite five-dimensional positions. Starting from the classical geodesic equations in five-dimensional spacetime, we derive the Schrödinger equation through dimensional projection and the assumption of w-confinement at the scale Δw ~ ℏ/(mc). The Planck constant ℏ emerges as a geometric quantity setting the width of the observational window in the w-direction. We show that Heisenberg's uncertainty principle, wave-particle duality, quantum tunneling, and entanglement all follow from the five-dimensional geometric structure without additional postulates. The theory makes a striking prediction: particles should possess excited states in the w-direction with masses m_n = (2n+1)m₀, where m₀ is the ground state mass and n = 0,1,2,... For electrons, this predicts states at 1.53 MeV/c², 2.56 MeV/c², and higher energies. Searches for these resonances in high-energy collisions provide direct experimental tests of the geometric origin of quantum mechanics. This work resolves the measurement problem by showing that wavefunction collapse is the process of dimensional projection from five to three dimensions, constrained by the observer's limited w-resolution. Quantum mechanics is thus revealed as the statistical mechanics of observers confined to lower-dimensional hypersurfaces within a deterministic five-dimensional spacetime. This is the second paper of a trilogy. The foundational framework is developed in "Five-Dimensional Hydrodynamic Spacetime: Time Density and Dark Energy Complementarity." Dark matter implications are addressed in "Dark Matter as Temporal Displacement in Five-Dimensional Hydrodynamic Spacetime."