Constructing Point Form Mass Operators from Interaction Lagrangians

Details Constructing Point Form Mass Operators from Interaction Lagrangians Constructing Point Form Mass Operators from Interaction Lagrangians

2000-12-08

arxiv.org/abs/nucl-th/0012031v2

Nucl.Phys. A716 (2003) 123-135

Physics

Nuclear Physics

Nuclear Theory

15 pages

Scientific paper

10.1016/S0375-9474(02)01406-9

Starting from an interaction Lagrangian formed out of local fields, an interacting four-momentum operator is constructed by integrating the interaction Lagrangian over the forward hyperboloid. Such a four-momentum operator has the property that the components commute among themselves; however, when the Fock space on which the four-momentum operator acts is truncated, the components no longer commute among themselves. By modifying matrix elements of the four-momentum operator on the truncated space, Bakamjian-Thomas mass operatorsare constructed which restore the Poincare relations. Examples for a simple Lagrangian are given.

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