We analyse the phase diagram of the lattice gauged Nambu-Jona Lasinio model with the help of a mean field approximation plus numerical simulations. We find a phase transition line in the coupling parameters space separating the chirally broken phase from the symmetric phase, which is in good qualitative agreement with results obtained in the quenched-ladder approximation. The mean field approximation relates the critical exponents along the continuous phase transition line with the mass dependence of the chiral condensate in the Coulomb phase of standard noncompact QED. Our numerical results for noncompact QED strongly suggest nonmean field exponents along the critical line.
THE GAUGED NAMBU-JONES LASINIO MODEL - A MEAN FILED CALCULATION WITH NONMEAN FIELD EXPONENTS
GALANTE, ANGELO;
1995-01-01
Abstract
We analyse the phase diagram of the lattice gauged Nambu-Jona Lasinio model with the help of a mean field approximation plus numerical simulations. We find a phase transition line in the coupling parameters space separating the chirally broken phase from the symmetric phase, which is in good qualitative agreement with results obtained in the quenched-ladder approximation. The mean field approximation relates the critical exponents along the continuous phase transition line with the mass dependence of the chiral condensate in the Coulomb phase of standard noncompact QED. Our numerical results for noncompact QED strongly suggest nonmean field exponents along the critical line.Pubblicazioni consigliate
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