Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
1994-11-24
Nucl.Phys.Proc.Suppl. 42 (1995) 663-665
Physics
High Energy Physics
High Energy Physics - Lattice
3 pages LaTeX submission to Lat' 94 proceedings, 3 PostScript figures incorporated using macro psfig
Scientific paper
10.1016/0920-5632(95)00343-8
Strongly coupled QED is a model whose physics is dominated by short-ranged effects. In order to assess which features of numerical simulations of the chiral phase transition are universal and which are not, we have formulated a quenched version of the model in which photon degrees of freedom are defined on a lattice of spacing a, but fermions only on a lattice of spacing 2a. The fermi-photon interaction is then obtained via a blocking procedure, whose parameters allow a degree of control over the relative importance of short wavelength modes. Results from a variety of models are presented; the critical exponents delta and beta governing the transition appear to be independent of the blocking, or even of whether a gauge-invariant action is used for the photons.
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