Abstract
In a nonperturbative formulation, radiative corrections arising from Lorentz and violation in the fermion sector induce a definite and nonzero Chern-Simons addition to the electromagnetic action. If instead a perturbative formulation is used, an infinite class of theories characterized by the value of the Chern-Simons coefficient emerges at the quantum level.
- Received 25 January 1999
DOI:https://doi.org/10.1103/PhysRevLett.82.3572
©1999 American Physical Society