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Prespacetime journal

Emergence of Quantum Mechanics from Iterated Maps

Ervin Goldfain

Published Jan 1, 2020• 0 citations
Publisher

Abstract

Iterated maps are deterministic models of dynamical systems in discrete time. A key feature of these models is the concept of invariant density associated with the asymptotic onset of stationarity. Drawing from the minimal fractality of spacetime near the Fermi scale, we show here that invariant density enables a step-by-step derivation of Quantum Mechanics from iterated maps.

DOI
10.13140/rg.2.2.10862.23365/1

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Iterated maps are deterministic models of dynamical systems in discrete time. A key feature of these models is the concept of invariant density associated with the asymptotic onset of stationarity. Drawing from the minimal fractality of spacetime near the Fermi scale, we show here that invariant density enables a step-by-step derivation of Quantum Mechanics from iterated maps.
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We study classical Hamiltonian systems in which the intrinsic proper time evolution parameter is related through a probability distribution to the physical time, which is assumed to be discrete. In this way, a physical clock with discrete states is introduced, which presently is still treated as decoupled from the system. This is motivated by the recent discussion of ``timeless'' reparametrization invariant models, where discrete physical time has been constructed based on quasi-local observables. Employing the path-integral formulation of classical mechanics developed by Gozzi et al., we show that these deterministic classical systems can be naturally described as unitary quantum mechanical models. We derive the emergent quantum Hamiltonian in terms of the underlying classical one. Such Hamiltonians typically need a regularization - here performed by discretization - in order to arrive at models with a stable groundstate in the continuum limit. This is demonstrated in several examples, recovering and generalizing a model advanced by 't Hooft.
This work proposes a novel conceptual framework for the foundations of physics, based on the idea that physical reality emerges from a discrete causal network of events and the accumulation of "memory" associated with these interactions. Unlike standard approaches, spacetime and elementary particles are not presupposed but emerge dynamically. The theory reinterprets General Relativity and Quantum Mechanics as manifestations of this memory dynamic in different density regimes. Concepts such as quantum collapse, the arrow of time, and particle properties are derived within this causal ontology. The work explores the consequences of applying the Heideggerian philosophical concept of historicity to the foundations of physics. Detailed appendices provide the mathematical formalization and emergent derivations.
The recently derived nonlocal quantum kinetic equation for dense interacting Fermi systems combines time derivatives with finite time stepping known from the logistic mapping. This continuous delay differential equation is a consequence of the microscopic delay time representing the dynamics of the deterministic chaotic system. The responsible delay time is explicitly calculated and discussed for short-range correlations. As a novel feature oscillations in the time evolution of the distribution function itself appear and bifurcations up to chaotic behavior occur. The temperature and density conditions are presented where such oscillations and bifurcations arise indicating an onset of phase transition.
The conceptual setting of quantum mechanics is subject to an ongoing debate from its beginnings until now. The consequences of the apparent differences between quantum statistics and classical statistics range from the philosophical interpretations to practical issues as quantum computing. In this note we demonstrate how quantum mechanics can emerge from classical statistical systems. We discuss conditions and circumstances for this to happen. Quantum systems describe isolated subsystems of classical statistical systems with infinitely many states. While infinitely many classical observables "measure" properties of the subsystem and its environment, the state of the subsystem can be characterized by the expectation values of only a few probabilistic observables. They define a density matrix, and all the usual laws of quantum mechanics follow. No concepts beyond classical statistics are needed for quantum physics – the differences are only apparent and result from the particularities of those classical statistical systems which admit a quantum mechanical description. In particular, we show how the non-commuting properties of quantum operators are associated to the use of conditiona probabilities within the classical system, and how a unitary time evolution reflects the isolation of the subsystem.