Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-02-23
Phys.Rev.D81:094022,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 19 figures
Scientific paper
10.1103/PhysRevD.81.094022
The quark propagator is calculated in the Nambu-Jona-Lasinio (NJL) model in a self-consistent 1/Nc-expansion at next-to-leading order. The calculations are carried out iteratively in Euclidean space. The chiral quark condensate and its dependence on temperature and chemical potential is calculated directly and compared with the mean-field results. In the chiral limit, we find a second-order phase transition at finite temperature and zero chemical potential, in agreement with universality arguments. At zero temperature and finite chemical potential, the phase transition is first order. In comparison with the mean-field results, the critical temperature and chemical potential are slightly reduced. We determine spectral functions from the Euclidean propagators by employing the Maximum-Entropy-Method (MEM). Thereby quark and meson masses are estimated and decay channels identified. For testing this method, we also apply it to evaluate perturbative spectral functions, which can be calculated directly in Minkowski space. In most cases we find that MEM is able to reproduce the rough features of the spectral functions, but not the details.
Buballa Michael
Muller Daniel
Wambach Jochen
No associations
LandOfFree
The Quark Propagator in the NJL Model in a self-consistent 1/Nc Expansion does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Quark Propagator in the NJL Model in a self-consistent 1/Nc Expansion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Quark Propagator in the NJL Model in a self-consistent 1/Nc Expansion will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-169552