Structure of the fermion propagator in QED3

Abstract

Minkowski structure of the Fermion propagator in QED${}_{2+1}$ is evaluated using dispersion like method Including massive fermion loop to the photon spectral function there is no infrared divergences in the gauge d=-1.Screening effects suppress the chiral order parmeter for small numbers of fermion flavour N.We evaluate the order parameter as a function of coupling constant c and N.There exsists a critical region where the chiral symmetry is dynamically broken.

7 pages,6 figures, in the proceedings of LIGHTCONE 2008.typos in eq(3.3) are corrected