An exact QED3+1 effective action

  title={An exact QED3+1 effective action},
  author={Gerald V. Dunne and Theodore M. Hall},
  journal={Physics Letters B},
Abstract We compute the exact QED 3+1 effective action for fermions in the presence of a family of static but spatially inhomogeneous magnetic field profiles. An asymptotic expansion of this exact effective action yields an all-orders derivative expansion, the first terms of which agree with independent derivative expansion computations. These results generalize analogous earlier results by Cangemi et al. in QED 2+1 . 
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