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Open AccessJournal ArticleDOI

Space-Time Approach to Non-Relativistic Quantum Mechanics

Richard Phillips Feynman
- 01 Apr 1948 - 
- Vol. 20, Iss: 2, pp 367-387
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TLDR
In this paper, the authors formulated non-relativistic quantum mechanics in a different way and showed that the probability of an event which can happen in several different ways is the absolute square of a sum of complex contributions, one from each alternative way.
Abstract
Non-relativistic quantum mechanics is formulated here in a different way. It is, however, mathematically equivalent to the familiar formulation. In quantum mechanics the probability of an event which can happen in several different ways is the absolute square of a sum of complex contributions, one from each alternative way. The probability that a particle will be found to have a path x(t) lying somewhere within a region of space time is the square of a sum of contributions, one from each path in the region. The contribution from a single path is postulated to be an exponential whose (imaginary) phase is the classical action (in units of ℏ) for the path in question. The total contribution from all paths reaching x, t from the past is the wave function ψ(x, t). This is shown to satisfy Schroedinger's equation. The relation to matrix and operator algebra is discussed. Applications are indicated, in particular to eliminate the coordinates of the field oscillators from the equations of quantum electrodynamics.

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Journal ArticleDOI

Analytical methods for perfect wedge diffraction: A review

TL;DR: Three less well-known and somewhat novel methods are offered, namely the embedding method, a random walk approach, and the technique of functionally-invariant solutions, which would be of interest even to specialists in the field.
Book ChapterDOI

VI Hamiltonian Theory of Beam Mode Propagation

TL;DR: In this article, the authors explain the Hamiltonian theory of beam mode propagation in unaberrated systems, which can be reduced to a routine application of the methods of Hamiltonian Optics because the continuation in the complex plane that is needed to take into account diffraction effects does not involve any formal change in the algebra.
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Action principle and quantization of gauge fields.

TL;DR: It is shown that the action principle solves the quantization problem of gauge fields without the recourse to path integrals, without the use of canonical commutation rules, and without the need of going to the complicated structure of the Hamiltonian.
Journal ArticleDOI

Quantum Mechanics on Homogeneous Spaces

TL;DR: In this paper, a complete description of quantum kinematics on a homogeneous G−space M is presented using imprimitivity systems for G based on M. The quantum system on M is considered (if possible and consistent with this quantization) as kinematic on a G−orbit equivalent to M in some Euclidean space Rn, and a physically justified and mathematically well-defined method of connecting the free Hamiltonian of a quantum system in Rn with an operator proportional to the Laplace−Beltrami operator on M (with the R

Advances in computational methods for Quantum Field Theory calculations

B.J.G. Ruijl
TL;DR: Forcer as mentioned in this paper is a program for the reduction of four-loop massless propagator integrals using the R* method, which can be used to compute the poles of Feynman integrals.