Thermal nonlocal Nambu--Jona-Lasinio model in the real time formalism

Details Thermal nonlocal Nambu--Jona-Lasinio model in the real time formalism Thermal nonlocal Nambu--Jona-Lasinio model in the real time formalism

2011-02-09

arxiv.org/abs/1102.1778v3

Phys.Rev.D83:096005,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 5 figures, minor changes, to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.83.096005

The real-time formalism at finite temperature and chemical potential for the nonlocal Nambu--Jona-Lasinio model is developed in the presence of a Gaussian covariant regulator. We construct the most general thermal propagator, by means of the spectral function. As a result, the model involves the propagation of massive quasiparticles. The appearance of complex poles is interpreted as a confinement signal, and in this case we have unstable quasiparticles with a finite decay width. An expression for the propagator along the critical line, where complex poles start to appear, is also obtained. A generalization to other covariant regulators is proposed.

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