Physical Review

Critical Remark on the Observability of the Sign Change of Spinors under 2π Rotations

Gerhard C. Hegerfeldt, K. Kraus

Published Jun 25, 1968• 17 citations

Abstract

In a recent paper, Aharonov and Susskind claimed rotations by 2π to have observable effects on spinors. Their reasoning is shown to be inconclusive.Received 21 September 1967DOI:https://doi.org/10.1103/PhysRev.170.1185©1968 American Physical Society

DOI: 10.1103/physrev.170.1185

Related papers

Is the sign change of spinors under 2π rotations observable?

J. S. Dowker

Hegerfeldt and Kraus's criticisms (see abstr. A42300 of 1968) of Aharonov and Susskind's discussion (see abstr. A27919 of 1967) of the above question are investigated. It is shown that the rotation operator applied to a wave function can be equivalent to solving Schrodinger's equation if gravitational fields are present. The specific example of quantum mechanics on a cone is considered in detail.

Journal of physics. A, Proceedings of the Physical Society. GeneralMay 1, 196918 citations

Observability of the Sign Change of Spinors under 2 π Rotations

Yakir Aharonov, Leonard Susskind

We consider the observability of the sign change of spinors under $2\ensuremath{\pi}$ rotations. We show that in certain circumstances there are observable consequences of such rotations, contrary to the classical case. We suggest experiments which can in principle be done to demonstrate such effects.

Physical ReviewJun 25, 1967199 citations

Causality Effects of Particles That Travel Faster Than Light

Roger G. Newton

This paper comments on a recent paper by Feinberg and describes an experiment in which an effect would precede its cause if there were particles that travel faster than light.Received 11 April 1967DOI:https://doi.org/10.1103/PhysRev.162.1274©1967 American Physical Society

Physical ReviewOct 25, 196754 citations

Self-Induced Transparency in Gases

C. K. N. Patel, R. E. Slusher

Physical Review LettersOct 30, 1967158 citations

Observability of 2π rotations: A proposed experiment

A. G. Klein, G. I. Opat

Rotations by $2\ensuremath{\pi}$ radians of spin-\textonehalf{} systems are predicted to give rise to factors of -1 in the wave function. We propose an experiment involving Fresnel diffraction of thermal neutrons to test this proposition.

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fieldsFeb 1, 197531 citations

Superfluidity of a Boson Gas

John M. Blatt, S. T. Butler

Physical ReviewNov 15, 19548 citations