Dedicated to the Third Centenary of the Publication of Principia: “Corollary IV.... and therefore the common center of gravity of all bodies acting upon each other (excluding external actions and impediments) is either at rest, or moves uniformly in a right line.” Is. Newton, Philosophiae Naturalis Principia Mathematica (S. Pepys, Julii 5, 1686, Londini)
Abstract
The relativistic center-of-mass motion for a system ofN fermions can be exactly separated because of the linearity of the Dirac operators in momenta which is not possible for quadratic Klein-Gordon particles. The covariant equations derived from Maxwell-Dirac field theory are considered. The center-of-mass equation is still a 4N-component spinor equation. We solve these equations for two- and three-body systems, as well as the relative motion for the non-interacting case, and discuss the quantum numbers and identification of eigenstates and eigenvalues. The results apply for both bound and scattering states.
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Barut, A.O., Strobel, G.L. Center-of-mass motion of a system of relativistic Dirac particles. Few-Body Systems 1, 167–180 (1986). https://doi.org/10.1007/BF01076709
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DOI: https://doi.org/10.1007/BF01076709