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A theory of emergent quantum mechanics

Ricardo Gallego Torromé

Published Feb 20, 2014• 4 citations
OpenAlex

Abstract

Hamilton-Randers dynamical systems, a particular class of Hamiltonian dynamical systems, are considered as mathematical models for deterministic emergent quantum mechanics. We show that in such framework, local diffeomorphism invariance, reversibility of the effective quantum dynamics and an universal maximal bound for proper acceleration emerge in that class of classical, deterministic and local models. Starting from the elements of Hamilton-Randers spaces, a phenomenological Hilbert space is constructed and associated with the space of wave functions of quantum mechanics. A geometric description for a spontaneous reduction of the quantum states, based on the concentration of measure phenomena as it appears in asymptotic Banach theory and probability theory, is described in general terms. It is also shown how the same concentration of measure phenomena plays a remarkable role in showing conditions for the existence of stable vacua states for the matter Hamiltonian. Furthermore, it is discussed the emergence of a weak equivalence principle from very fundamental principles of mathematical analysis and the basic assumptions of Hamilton-Randers theory. This fact, together with the existence in the theory of a maximal speed and the property of diffeomorphism invariance of the interaction driving the reduction of the quantum state, suggest that the reduction of the quantum state is driven by a gravitational type interaction. Moreover, since such interaction appears only in the dynamical domain when localization happens, it must be associated with a classical interaction. We make the hypothesis that such identification is universal and that indeed gravity is a domain of the dynamics of Hamilton-Randers systems. Hence Hamilton-Randers theory provides an unification scheme where quantum mechanics and classical gravity are both emergent.

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Hamilton-Randers dynamical systems, a particular class of Hamiltonian dynamical systems, are considered as mathematical models for deterministic emergent quantum mechanics. We show that in such framework, local diffeomorphism invariance, reversibility of the effective quantum dynamics and an universal maximal bound for proper acceleration emerge in that class of classical, deterministic and local models. Starting from the elements of Hamilton-Randers spaces, a phenomenological Hilbert space is constructed and associated with the space of wave functions of quantum mechanics. A geometric description for a spontaneous reduction of the quantum states, based on the concentration of measure phenomena as it appears in asymptotic Banach theory and probability theory, is described in general terms. It is also shown how the same concentration of measure phenomena plays a remarkable role in showing conditions for the existence of stable vacua states for the matter Hamiltonian. Furthermore, it is discussed the emergence of a weak equivalence principle from very fundamental principles of mathematical analysis and the basic assumptions of Hamilton-Randers theory. This fact, together with the existence in the theory of a maximal speed and the property of diffeomorphism invariance of the interaction driving the reduction of the quantum state, suggest that the reduction of the quantum state is driven by a gravitational type interaction. Moreover, since such interaction appears only in the dynamical domain when localization happens, it must be associated with a classical interaction. We make the hypothesis that such identification is universal and that indeed gravity is a domain of the dynamics of Hamilton-Randers systems. Hence Hamilton-Randers theory provides an unification scheme where quantum mechanics and classical gravity are both emergent.
Quantum systems are viewed as emergent systems from the fundamental degrees of freedom. The laws and rules of quantum mechanics are understood as an effective description, valid for the emergent systems and specially useful to handle probabilistic predictions of observables. After introducing the geometric theory of Hamilton-Randers spaces and reformulating it using Hilbert space theory, a Hilbert space structure is constructed from the Hilbert space formulation of the underlying Hamilton-Randers model and associated with the space of wave functions of quantum mechanical systems. We can prove the emergence of the Born rule from ergodic considerations. A geometric mechanism for a natural spontaneous collapse of the quantum states based on the concentration of measure phenomena as it appears in metric geometry is discussed.We show the existence of stable vacua states for the quantized matter Hamiltonian. Another consequence of the concentration of measure is the emergence of a weak equivalence principle for one of the dynamics of the fundamental degrees of freedom. We suggest that the reduction of the quantum state is driven by a gravitational type interaction. Such interaction appears only in the dynamical domain when localization of quantum observables happens, it must be a classical interaction. We discuss the double slit experiment in the context of the framework proposed, the interference phenomena associated with a quantum system in an external gravitational potential, a mechanism explaining non-quantum locality and also provide an argument in favour of an emergent interpretation of every macroscopic time parameter. Entanglement is partially described in the context of Hamilton-Randers theory and how naturally Bell's inequalities should be violated.
Quantum systems are viewed as emergent systems from the fundamental degrees of freedom. The laws and rules of quantum mechanics are understood as an effective description, valid for the emergent systems and specially useful to handle probabilistic predictions of observables. After introducing the geometric theory of Hamilton-Randers spaces and reformulating it using Hilbert space theory, a Hilbert space structure is constructed from the Hilbert space formulation of the underlying Hamilton-Randers model and associated with the space of wave functions of quantum mechanical systems. We can prove the emergence of the Born rule from ergodic considerations. A geometric mechanism for a natural spontaneous collapse of the quantum states based on the concentration of measure phenomena as it appears in metric geometry is discussed.We show the existence of stable vacua states for the quantized matter Hamiltonian. Another consequence of the concentration of measure is the emergence of a weak equivalence principle for one of the dynamics of the fundamental degrees of freedom. We suggest that the reduction of the quantum state is driven by a gravitational type interaction. Such interaction appears only in the dynamical domain when localization of quantum observables happens, it must be a classical interaction. We discuss the double slit experiment in the context of the framework proposed, the interference phenomena associated with a quantum system in an external gravitational potential, a mechanism explaining non-quantum locality and also provide an argument in favour of an emergent interpretation of every macroscopic time parameter. Entanglement is partially described in the context of Hamilton-Randers theory and how naturally Bell's inequalities should be violated.
In this thesis, we lay out the goal, and a broad outline, for a program that takes quantum mechanics in its minimal form to be the fundamental ontology of the universe. Everything else, including features like space-time, matter and gravity associated with classical reality, are emergent from these minimal quantum elements. We argue that the Hilbert space of quantum gravity is locally finite-dimensional, in sharp contrast to that of conventional field theory, which could have observable consequences for gravity. We also treat time and space on an equal footing in Hilbert space in a reparametrization invariant setting and show how symmetry transformations, both global and local, can be treated as unitary basis changes. Motivated by the finite-dimensional context, we use Generalized Pauli Operators as finite-dimensional conjugate variables and define a purely Hilbert space notion of locality based on the spread induced by conjugate operators which we call "Operator Collimation." We study deviations in the spectrum of physical theories, particularly the quantum harmonic oscillator, induced by finite-dimensional effects, and show that by including a black hole-based bound in a lattice field theory, the quantum contribution to the vacuum energy can be suppressed by multiple orders of magnitude. We then show how one can recover subsystem structure in Hilbert space which exhibits emergent quasi-classical dynamics. We explicitly connect classical features (such as pointer states of the system being relatively robust to entanglement production under environmental monitoring and the existence of approximately classical trajectories) with features of the Hamiltonian. We develop an in-principle algorithm based on extremization of an entropic quantity that can sift through different factorizations of Hilbert space to pick out the one with manifest classical dynamics. This discussion is then extended to include direct sum decompositions and their compatibility with Hamiltonian evolution. Following this, we study quantum coarse-graining and state-reduction maps in a broad context. In addition to developing a first-principle quantum coarse-graining algorithm based on principle component analysis, we construct more general state-reduction maps specified by a restricted set of observables which do not span the full algebra (as could be the case of limited access in a laboratory or in various situations in quantum gravity). We also present a general, not inherently numeric, algorithm for finding irreducible representations of matrix algebras. Throughout the thesis, we discuss implications of our work in the broader goal of understanding quantum gravity from minimal elements in quantum mechanics.
This work presents a reconstruction of quantum mechanics in which Schrödinger-type dynamics emerges from reversible probabilistic evolution rather than being postulated. Starting from a normalized probability density, we impose reversible probability dynamics, Fisher information geometry, and classical correspondence. These compatibility conditions yield coupled real equations equivalent to the continuity equation and the Hamilton–Jacobi equation with an additional information curvature (quantum potential) term. By combining density and phase into a complex amplitude, the Schrödinger equation appears as a compact encoding of reversible statistical flow. The result is mathematically equivalent to the Madelung hydrodynamic formulation and structurally connected to Bohmian mechanics, but derived without assuming Hilbert space, operator axioms, or measurement postulates. The work can therefore be viewed as an information-geometric derivation of quantum dynamics: quantum theory arises as the unique consistent representation of reversible probability flow. Keywords: quantum foundations, quantum reconstruction, emergent quantum mechanics, derivation of the Schrödinger equation, information geometry, Fisher information, Hamilton–Jacobi theory, Madelung formulation, Bohmian mechanics, reversible probability dynamics