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Gauging kinematical and internal symmetry groups for extended systems

Published online by Cambridge University Press:  05 November 2011

Roberto De Pietri
Affiliation:
Universita di Parma and I.N.F.N.
Massimo Pauri
Affiliation:
Universita di Parma and I.N.F.N.
Luca Lusanna
Affiliation:
I.N.F.N.
John M. Charap
Affiliation:
Queen Mary University of London
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Summary

Abstract

The possible external couplings of an extended non-relativistic classical system are characterized by gauging its maximal symmetry group at the center-of-mass. The Galilean one-time and two-times harmonic oscillators are exploited as models.

Introduction

In this paper we exploit the gauge technique to characterize the possible couplings of extended systems. The non-relativistic harmonic oscillator with center-of-mass is used as a model. We make the ansatz that the essential structural elements and the extension of a dynamical system are represented and summarized by its maximal dynamical symmetry group viz. by the algebraic structure of the constants of the motion. Then, we apply the gauge procedure to this group by localizing it at the center-of-mass of the system. We show thereby that the gauge procedure is meaningful also for dynamical symmetries besides the usual kinematical ones. In spite of the evident paradigmatic and heuristic nature of our ansatz, the results obtained here seem notably expressive.

The technical steps of the work are the following: 1) the standard Utiyama procedure for fields is applied to the possible trajectories of the center-of-mass as described by a canonical realization of the extended Galilei group. This determines the gravitational-inertial fields which can couple to the center-of-mass itself. As shown elsewhere [4], the requirement of invariance (properly quasi-invariance) of the Lagrangian leads to the introduction of eleven gauge compensating fields and their transformation properties. 2) The generalized Utiyama procedure is then applied to the internal dynamical U(3) symmetry so that gauge compensating fields have to be introduced in connection to the internal angular momentum (spin) and the quadrupole momentum.

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Publisher: Cambridge University Press
Print publication year: 1995

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