Abstract
We study quenched quantum electrodynamics (QED) on a lattice in the noncompact formulation. Near the chiral critical point, we avoid critical slowing down using fast-Fourier-transform methods which allow us to obtain critical indices with good accuracy. Using lattices of and sites and masses between 0.025 and 0.0007 (lattice units) we found that the critical behavior of QED is described by power laws with critical exponents differing from mean-field results. The critical coupling is , the exponent is 2.2±0.1, and the magnetic exponent is 0.78±0.08. A physical explanation of our results is presented.
- Received 22 October 1990
DOI:https://doi.org/10.1103/PhysRevD.43.R1763
©1991 American Physical Society