Convergence of quantum electrodynamics on the Poincare group

TL;DR

This paper develops a framework for quantum electrodynamics using fields on the Poincaré group, defining wave equations for extended particles of any spin and analyzing interactions and S-matrix convergence.

Contribution

It introduces a novel approach to quantum electrodynamics by formulating wave equations on the Poincaré group and demonstrates the convergence of the S-matrix elements in this setting.

Findings

Wave equations for extended particles of any spin are defined on homogeneous spaces.

Massless spin-1 fields are described within principal series representations.

The S-matrix elements are shown to be convergent integrals.

Abstract

Extended particles are considered in terms of the fields on the Poincar\'{e} group. Dirac like wave equations for extended particles of any spin are defined on the various homogeneous spaces of the Poincar\'{e} group. Free fields of the spin 1/2 and 1 (Dirac and Maxwell fields) are considered in detail on the eight-dimensional homogeneous space, which is equivalent to a direct product of Minkowski spacetime and two-dimensional complex sphere. It is shown that a massless spin-1 field, corresponding to a photon field, should be defined within principal series representations of the Lorentz group. Interaction between spin-1/2 and spin-1 fields is studied in terms of a trilinear form. An analogue of the Dyson formula for $S$-matrix is introduced on the eight-dimensional homogeneous space. It is shown that in this case elements of the $S$-matrix are defined by convergent integrals.