M.C. Nemes

Consistency in regularizations of the gauged NJL model at the one loop level

In this work we reexamine questions recently raised in the literature associated with relevant but divergent amplitudes in the gauged NJL model. The questions raised involve ambiguities and symmetry violations which concern the models predictive power at the one loop level. Our study shows, by means of an alternative prescription to handle divergent amplitudes, that it is possible to obtain unambiguous and symmetry preserving amplitudes. The procedure adopted makes use solely of general properties of an eventual regulator, thus avoiding an explicit form. We find, after a thorough analysis of the problem, that there are well established conditions to be satisfied by any consistent regularization prescription in order to avoid the problems of concern at the one loop level.

Action principle for the classical dual electrodynamics

Abstract The purpose of this paper is to formulate an action principle which allows for the construction of a classical lagrangian including both electric and magnetic currents. The lagrangian is non-local and shown to yield all the expected (local) equations for dual electrodynamics.

Low-energy dynamics of the γγ → ππ reaction in the NJL model

We calculate the one-quark-loop amplitude for the low energy

Simple parametrizations of light meson properties in hot or dense matter

gammagammatopipi

Aspects of pseudoscalar meson production in two-photon fusion

collision in the context of the Nambu and Jona-Lasinio model with scalar and pseudoscalar four quark couplings to all orders in the external momenta. We show that the NJL predictions for the

Statistical approach for quantum gravity fluctuations in QFT

gammagammatopi^+pi^-

Pion, sigma and nucleon propagators in the linear σ-model

reaction are not far from the Born amplitude, which is close to the data, and is compatible with the chiral perturbation theory estimations. We determine the corrections given by the NJL model in leading order of

Momentum dependent vertices σγγ, σργ and σρρ the NJL scalar hidden by chiral symmetry

1/N_c

On the renormalization of a bosonized version of the chiral fermion–meson model at finite temperature

to the chiral loop amplitude for

Low-energy dynamics of the

gammagammatopi^0pi^0