330 research outputs found
Phase structure of Topologically massive gauge theory with fermion
Using Bloch-Nordsieck approximation fermion propagator in 3-dimensional gauge
theory with topological mass is studied. Infrared divergence of Chern-Simon
term is soft,which modifies anomalous dimension. In unquenched QCD with
2-component spinor anomalous dimension has fractional value,where order
parmeter is divergent.Comment: 3 pages,Latex,no figures,for the proceedings of strong coupling gauge
theory.typos corrected. anomalous dimension is corrected
Determination of the propagator in QED3 by spectral function
To study the infrared behaviour of the propagator, exponentiation of the
lowest order spectral function has been known.We show this method is helpful in
super renormalizable theory with dimension-full coupling constant.In the 1/N
approximation anomalous dimension is independent of ,which plays an
important role for confinement and pair condensation.Comment: 6 pages Latex,2 figures.introduction is modified.mistakes in
equations are corrected.figure captions are correcte
Mass singularity and confinement
Infrared behaviour of the fermion propagator is examined by spectral
representation.Assuming asymptotic states and using LSZ reduction formula we
evaluate the the lowest order spectral function by definition.After
exponentiation of it we derive the non perturbative propagator.It shows
confinement and dynamical mass generation explicitly.Comment: 7pages,latex,prepared for light-cone 2005,typos corrected,add
reference
Infrared behaviour of the fermion propagator in unquenched QED with finite threshold effects
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 flavour, dependence of order
parameter is mild which may be due to screening effects.Comment: 12pages,6figures,Rev.tex4,typos in (13),(17),(18) are correcte
- …