Finite Quantum Fluctuations About Static Field Configurations
  We develop an unambiguous and practical method to calculate one-loop quantum corrections to the energies of classical time-independent field configurations in renormalizable field theories. We show that the standard perturbative renormalization procedure suffices here as well. We apply our method to a simplified model where a charged scalar couples to a neutral "Higgs" field, and compare our results to the derivative expansion. 
Edward Farhi, Noah Graham, Peter E. Haagensen, Robert L. Jaffe