Abstract
Quantum dynamical time-evolution of bosonic fields is shown to be equivalent to a stochastic trajectory in space-time, corresponding to samples of a statistical mechanical steady-state in a higher dimensional quasi-time. This is proved using the Q-function of quantum theory with time-symmetric diffusion, that is equivalent to a forward-backward stochastic process in both the directions of time. The resulting probability distribution has a positive, time-symmetric action principle and path integral, whose solution corresponds to a classical field equilibrating in an additional dimension. Comparisons are made to stochastic quantization and other higher dimensional physics proposals. Five-dimensional space-time was originally introduced by Kaluza and Klein, and is now widely proposed in cosmology and particle physics. Time-symmetric action principles for quantum fields are also related to electrodynamical absorber theory, which is known to be capable of violating a Bell inequality. We give numerical methods and examples of solutions to the resulting stochastic partial differential equations in a higher time-dimension, giving agreement with exact solutions for soluble boson field quantum dynamics. This approach may lead to useful computational techniques for quantum field theory, as the action principle is real, as well as to ontological models of physical reality.
Highlights
The role that time plays in quantum mechanics is a deep puzzle in physics, since quantum measurement appears to preferentially choose a particular time direction, via the projection postulate
To obtain a solution for the time-symmetric propagator (TSP), we introduce timesymmetric stochastic differential equations to define a set of stochastic paths
The existence of a time-symmetric probabilistic action principle for quantum fields describes a different approach to the understanding of quantum dynamics
Summary
The role that time plays in quantum mechanics is a deep puzzle in physics, since quantum measurement appears to preferentially choose a particular time direction, via the projection postulate. In the cases treated here, quantum field dynamics is shown to be equivalent to a time-symmetric stochastic process. Time-reversible methods have been studied in quantum physics [13,14,15,16], the philosophy of science [17], and used to explain Bell violations [18] We use this general approach to analyze interacting fields, giving time-symmetric quantum physics a strong foundation. The time-symmetric techniques given here use a different approach, as well as providing a model for a quantum ontology To demonstrate these results, a general quartic quantum field Hamiltonian is introduced. A detailed treatment is given of the simplest boson-boson case This leads to a time-symmetric stochastic differential equations, a quantum action principle and a probabilistic path integral.
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