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arXiv · 1102.1778

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

M. Loewe·P. Morales·C. Villavicencio
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Abstract

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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M. Loewe, P. Morales, C. Villavicencio. 2011-02-09. Thermal nonlocal Nambu--Jona-Lasinio model in the real time formalism. https://doi.org/10.1103/physrevd.83.096005

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