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arXiv 1102.1778hep-phnucl-th
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热非定域Nambu-Jona-Lasinio模型的实时形式

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

M. Loewe, P. Morales, C. Villavicencio

摘要:

在有限温度和有限化学势下,发展了非定域Nambu-Jona-Lasinio模型在高斯协变调节器作用下的实时形式.利用谱函数构造了最一般的热传播子。因此,该模型涉及大量准粒子的传播。复数极点的出现被解释为一个约束信号,在这种情况下,我们有一个有限的衰变宽度不稳定的准粒子。传播子沿临界线的表达式,复极点开始出现,也得到。其他协变调节器的推广。

英文摘要:

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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