Infrared behaviour of the fermion propagator in unquenched QED3 with finite threshold effects
نویسنده
چکیده
Yuichi Hoshino Kushiro National College of Technology, Otanoshike Nishi 2-32-1,Kushiro City,HOkkaido 084,Japan (Dated:) Abstract To remove the linear infrared divergences in quenched approximation we include the massive fermion loop to the photon spectral function.Spectral function of fermion has no one particle singularity if we fix the anomalous dimension to be unity.In the case of N flavour,N dependence of order parameter is mild which may be due to screening effects.
منابع مشابه
ar X iv : h ep - t h / 05 12 15 2 v 2 3 A pr 2 00 6 Spectral function in QED 3 Yuichi
Abstract We discuss the structure of the dressed fermion propagator in unquenched QED3 based on spectral function of photon.In this approximation infrared divergences that appeared in quenched case turns out to be soft.The dimension full coupling constant naturally appears as an infrared mass scale in this case.We find the reliable results for the effects of vacuum polarization for the dressed ...
متن کاملInfrared Divergence in Qed3 at Finite Temperature
We consider various ways of treating the infrared divergence which appears in the dynamically generated fermion mass, when the transverse part of the photon propagator in N flavour QED3 at finite temperature is included in the Matsubara formalism. This divergence is likely to be an artefact of taking into account only the leading order term in the 1 N expansion when we calculate the photon prop...
متن کاملColor Confinement in lattice Landau gauge with unquenched Wilson and KS fermions
The Kugo-Ojima confinement criterion is verified in the unquenched Landau gauge QCD simulation. The valence quark propagator of the Kogut-Susskind fermion with use of the fermion action including the Naik term and the staple contribution is calculated on MILC Asqtad unquenched gauge configurations, and it shows clear evidence of infrared vanishing of the quark propagator.
متن کاملRoles of the quark field in the infrared lattice Coulomb gauge and Landau gauge QCD
The effective coupling of QCD is measured by using the gauge configurations produced by the MILC collaboration in which the Kogut Susskind (KS) fermion is incorporated and by using that produced by the QCDOC collaboration in which the domain wall fermion (DWF) is incorporated. We fix the gauge to the Landau gauge and to the Coulomb gauge. The infrared effective coupling in the Coulomb gauge agr...
متن کاملGauge Covariance and the Chiral Condenate in QED3
The ambiguities associated with the lack of gauge invariance in the non-perturbative truncations of Schwinger-Dyson equations (SDEs) are a challenging problem which has not yet been resolved in a decisive fashion. Pursuing this aim, we study dynamical chiral symmetry breaking in quantum electrodynamics in three space-time dimensions (QED3). We investigate the gauge dependence of the chiral cond...
متن کامل