Thermodynamic instabilities in nonlocal NJL models
High Energy Physics - Phenomenology
2014-09-02 v1 Nuclear Theory
Abstract
It has been recently pointed out, that nonlocal Nambu--Jona-Lasinio models, may present unphysical thermodynamical behavior like negative pressure and oscillating entropy. Here we show how these thermodynamic instabilities can be related to the analytical structure of the poles of the quark propagator in the model. The analysis is carried out for two different regulators and we show, in each case, how the instabilities are related to the pressence of highly unstable poles. We also argue that the softening of these instabilities by the inclusion of the Polyakov loop is related to the effect the latter has on the poles of the propagator.
Cite
@article{arxiv.1409.0500,
title = {Thermodynamic instabilities in nonlocal NJL models},
author = {M. Loewe and F. Marquez and C. Villavicencio},
journal= {arXiv preprint arXiv:1409.0500},
year = {2014}
}
Comments
Contribution to the QCD 14 conference in Montpellier. To appear in the proceedings