Anomalous states of positronium

@article{Patterson2019AnomalousSO,
  title={Anomalous states of positronium},
  author={Chris W. Patterson},
  journal={Physical Review A},
  year={2019},
  volume={100},
  pages={062128}
}
The energies and wave functions of the two-body Dirac equation for positronium are compared with those of the Pauli approximation and the Bethe-Salpeter equation. The unusual behavior of the ground-state wave function of the Dirac equation is explained in terms of anomalous bound-state solutions 
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