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    Öğe
    An exactly soluble relativistic quantum two-fermion problem
    (1986) Barut, Asım O.; Ünal, Nuri
    The two-fermion problem of quantum electrodynamics in which both particles are treated relativistically and full spin degrees of freedom are taken into account is shown to be exactly soluble when potentials up to order ?4 are kept. It is therefore a good starting point for radiative corrections of higher order for the precision tests of QED in bound-state problems. Recoil corrections are included to all orders.
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    Öğe
    Radial equations for the relativistic two‐fermion problem with the most general electric and magnetic potentials
    (Akademie Verlag Gmbh, 1985) Barut, Asım O.; Ünal, Nuri
    The 16 × 16 spinor equations of two fermions interacting with their charges and anomalous magnetic moments have been separated first covariantly into center of mass and relative coordinates, then completely into angular and radial parts. The 16 radial equations reduce by a symmetry into two sets of 8 equations, four of which are algebraic. The final result is a set of four first order equations or two coupled second order equations.