Time-Symmetric Boundary Conditions and Quantum Foundations

  title={Time-Symmetric Boundary Conditions and Quantum Foundations},
  author={Ken B. Wharton},
  • K. Wharton
  • Published 8 March 2010
  • Philosophy
  • Symmetry
Despite the widely-held premise that initial boundary conditions (BCs) corresponding to measurements/interactions can fully specify a physical subsystem, a literal reading of Hamilton’s principle would imply that both initial and final BCs are required (or more generally, a BC on a closed hypersurface in spacetime). Such a time-symmetric perspective of BCs, as applied to classical fields, leads to interesting parallels with quantum theory. This paper will map out some of the consequences of… 

The Surjective Mapping Conjecture and the Measurement Problem in Quantum Mechanics

This work proposes an alternate two-boundary concept called surjective mapping conjecture, which takes as fundamental a quantum-time running forward like the usual time on the wave-function side and backward on the complex conjugate side and determines the measurement path of the expanding and contracting quantum- time universe in the required way.

An Intricate Quantum Statistical Effect and the Foundation of Quantum Mechanics

  • F. Bopp
  • Physics
    Foundations of Physics
  • 2021
An intricate quantum statistical effect guides us to a deterministic, non-causal quantum universe with a given fixed initial and final state density matrix. A concept is developed on how and where

A Realistic Theory of Quantum Measurement

We propose that the ontic understanding of quantum mechanics can be extended to a fully realistic theory that describes the evolution of the wavefunction at all times, including during a measurement.

A Realistic Theory of Quantum Measurement

We propose that the ontic understanding of quantum mechanics can be extended to a fully realistic theory that describes the evolution of the wavefunction at all times, including during a measurement.

A New Class of Retrocausal Models

Several example models are developed that resolve the most essential problems with using classical electromagnetic fields to explain single-photon phenomena, and share some similarities with Stochastic Electrodynamics, but without the infinite background energy problem.

The End of a Classical Ontology for Quantum Mechanics?

It is argued that the Shrapnel–Costa no-go theorem undermines the last remaining viability of the view that the fundamental ontology of quantum mechanics is essentially classical, and that accepting causal symmetry is more economical than rejecting a classical ontology.

Measurement Problem in Quantum Mechanics and the Surjection Hypothesis

Starting with unitary quantum dynamics, we investigate how to add quantum measurements. Quantum measurements have four essential components: the furcation, the witness production, an alignment

How to Avoid Absolute Determinismin Two Boundary Quantum Dynamics

  • F. Bopp
  • Philosophy
    Quantum Reports
  • 2020
A somewhat drastic but beautiful way to avoid a problem with simple implementations of the two boundary theory, where effective or real willful decisions can not be added as there is no consecutive macroscopic time ordering.

Quantum mechanics, emergence, and fundamentality

Quantum mechanics arguably provides the best evidence we have for strong emergence. Entangled pairs of particles apparently have properties that fail to supervene on the properties of the particles



Quantum mechanics as a consistency condition on initial and final boundary conditions

Extending Hamilton's principle to quantize classical fields

Hamilton's principle does not formally apply to systems whose boundary conditions lie outside configuration space, but extensions are possible using certain "natural" boundary conditions that allow

A Novel Interpretation of the Klein-Gordon Equation

The covariant Klein-Gordon equation requires twice the boundary conditions of the Schrödinger equation and does not have an accepted single-particle interpretation. Instead of interpreting its

Compact Time and Determinism for Bosons: Foundations

Free bosonic fields are investigated at a classical level by imposing their characteristic de Broglie periodicities as constraints. In analogy with finite temperature field theory and with

Time-Symmetric Quantum Mechanics

A time-symmetric formulation of nonrelativistic quantum mechanics is developed by applying two consecutive boundary conditions onto solutions of a time- symmetrized wave equation. From known

Action Duality: A Constructive Principle for Quantum Foundations

An analysis of the path integral approach to quantum theory motivates the hypothesis that two experiments with the same classical action should have dual ontological descriptions, allowing any realistic model of one experiment to generate a corresponding model for its action-dual.

Fulling Non‐uniqueness and the Unruh Effect: A Primer on Some Aspects of Quantum Field Theory

We discuss the intertwined topics of Fulling non‐uniqueness and the Unruh effect. The Fulling quantization, which is in some sense the natural one for an observer uniformly accelerated through

Realism and time symmetry in quantum mechanics

Exponential complexity and ontological theories of quantum mechanics

Ontological theories of quantum mechanics describe a single system by means of well-defined classical variables and attribute the quantum uncertainties to our ignorance about the underlying reality