Role of ambiguities and gauge invariance in the calculation of the radiatively induced Chern-Simons shift in extended QED

@article{Battistel2001RoleOA,
  title={Role of ambiguities and gauge invariance in the calculation of the radiatively induced Chern-Simons shift in extended QED},
  author={O. Battistel and G. Dallabona},
  journal={Nuclear Physics},
  year={2001},
  volume={610},
  pages={316-330}
}
Abstract We investigate the possibility of Lorentz and CPT violations in the photon sector, of the Chern–Simons form, be induced by radiative corrections arising from the Lorentz and CPT non-invariant fermionic sector of an extended version of QED. By analyzing the modified vacuum polarization tensor, three contributions are considered: two of them can be identified with well known amplitudes; the (identical) QED vacuum polarization tensor and the (closely related) AVV triangle amplitude. These… Expand
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