An exact QED_{3+1} effective action
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 allorders 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}.
 Publication:

Physics Letters B
 Pub Date:
 February 1998
 DOI:
 10.1016/S03702693(97)014299
 arXiv:
 arXiv:hepth/9710062
 Bibcode:
 1998PhLB..419..322D
 Keywords:

 High Energy Physics  Theory
 EPrint:
 7 pages, Latex, no figures