Affordable Access

deepdyve-link deepdyve-link
Publisher Website

Invariances of Approximately Relativistic Hamiltonians and the Center-Of-Mass Theorem

Authors
  • Stachel, J.
  • Havas, P.
Publication Date
Jan 01, 1976
Identifiers
DOI: 10.1103/PhysRevD.13.1598
OAI: oai:inspirehep.net:113809
Source
INSPIRE-HEP
License
Unknown
External links

Abstract

In an earlier paper we considered a class of Lagrangians for directly interacting particles, arising from a slow-motion approximation in various special- and general-relativistic field theories. It was shown that if the Lagrangian is invariant under time and space translations this implies invariance under an additional three-parameter set of infinitesimal transformations, which leads directly to the center-of-mass theorem. This result is rederived here in a Hamiltonian formalism, in which these infinitesimal transformations are shown to be generators of a Lie symmetry group in phase space. Then we consider the problem of the most general form possible of a canonical post-Newtonian theory that is a realization of the Lie algebra of the Poincaré group to order c−2 and that arises from a theory of the usual Newtonian type with two-body interactions. It is found that in such a theory the world-line condition is satisfied to order c−2. This canonical theory encompasses all the approximately relativistic interactions, found recently by Woodcock and Havas, which follow from a Fokker-type special-relativistic variational principle for particles with direct two-body interactions. The relation of our work to various other approaches to approximately relativistic theories of interacting particles is discussed.

Report this publication

Statistics

Seen <100 times