Comment on the equivalence of Bakamjian-Thomas mass operators in different forms of dynamics

Details Comment on the equivalence of Bakamjian-Thomas mass operators in different forms of dynamics Comment on the equivalence of Bakamjian-Thomas mass operators in different forms of dynamics

2010-08-31

arxiv.org/abs/1008.5222v1

Physics

Mathematical Physics

6 pages, no figures

Scientific paper

We discuss the scattering equivalence of the generalized Bakamjian-Thomas construction of dynamical representations of the Poincar\'e group in all of Dirac's forms of dynamics. The equivalence was established by Sokolov in the context of proving that the equivalence holds for models that satisfy cluster separability. The generalized Bakamjian Thomas construction is used in most applications, even though it only satisfies cluster properties for systems of less than four particles. Different forms of dynamics are related by unitary transformations that remove interactions from some infinitesimal generators and introduce them to other generators. These unitary transformation must be interaction dependent, because they can be applied to a non-interacting generator and produce an interacting generator. This suggests that these transformations can generate complex many-body forces when used in many-body problems. It turns out that this is not the case. In all cases of interest the result of applying the unitary scattering equivalence results in representations that have simple relations, even though the unitary transformations are dynamical. This applies to many-body models as well as models with particle production. In all cases no new many-body operators are generated by the unitary scattering equivalences relating the different forms of dynamics. This makes it clear that the various calculations used in applications that emphasize one form of the dynamics over another are equivalent. Furthermore, explicit representations of the equivalent dynamical models in any form of dynamics are easily constructed. Where differences do appear is when electromagnetic probes are treated in the one-photon exchange approximation. This approximation is different in each of Dirac's forms of dynamics.

Affiliated with

Also associated with

No associations

Rating

Comment on the equivalence of Bakamjian-Thomas mass operators in different forms of dynamics does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Comment on the equivalence of Bakamjian-Thomas mass operators in different forms of dynamics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Comment on the equivalence of Bakamjian-Thomas mass operators in different forms of dynamics will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-179549