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arXiv 1401.3722hep-ph
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热非定域Nambu-Jona-Lasinio模型中作为热力学不稳定性源的不稳定准粒子

Unstable quasiparticles as a source of thermodynamic instabilities in the thermal nonlocal Nambu-Jona-Lasinio model

F. Marquez

摘要:

已经表明,在热非局部Nambu-Jona-Lasinio模型中,可能会出现一些非物理行为,例如负压。在这篇文章中,它是如何表现出这种行为可以与传播的模型的存在高度不稳定的极点,高斯和洛伦兹监管机构的情况下。在实时形式主义,它允许隔离的贡献,从不同的极点,并确定这些不稳定性的来源进行计算。最近的文章也表明,当考虑高斯调节器时,这些不稳定性是如何通过包含Polyakov回路来软化的。这篇文章展示了如何软化的不稳定性,可以理解通过研究的效果Polyakov环上的传播高斯调节器的极点。

英文摘要:

It has already been shown that in thermal nonlocal Nambu-Jona-Lasinio models some unphysical behavior, such as a negative pressure, may arise. In this article, it is shown how this behavior can be related to the pressence of highly unstable poles of the propagator of the model, for both the Gaussian and Lorentzian regulators cases. Computations are carried out within the real time formalism, which allows to isolate the contributions from different poles and identify the source of these instabilities. It has also been shown in recent articles how these instabilities are softened by the inclusion of the Polyakov loop when a Gaussian regulator is considered. This article shows how the softening of instabilities can be understood by studying the effect of the Polyakov loop on the poles of the propagator for the Gaussian regulator.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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