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arXiv 0705.0676hep-thcond-mat.softhep-ph
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无质量2+1维Gross-Neveu模型中三临界点和液气相的出现

Emergence of Tricritical Point and Liquid-Gas Phase in the Massless 2+1 Dimensional Gross-Neveu Model

Jean-Loic Kneur, Marcus Benghi Pinto, Rudnei O. Ramos, Ederson Staudt

摘要:

本文用优化微扰理论对2+1维无质量Gross-Neveu模型进行了全面的理论分析。这是一种非微扰方法,使我们能够超越已知的大N结果已经在最低阶。我们的结果表明,对于有限数量的费米子N,在离散手征相变的温度和化学势相图中存在一个三临界点,这使我们能够精确地定位它.通过研究压力和密度倒数平面上的相图,我们还发现了迄今为止在该模型中未知的液-气相的存在.最后,我们还导出了费米子质量、临界温度和临界化学势与N有关的解析表达式。

英文摘要:

A complete thermodynamical analysis of the 2+1 dimensional massless Gross-Neveu model is performed using the optimized perturbation theory. This is a non-perturbative method that allows us to go beyond the known large-N results already at lowest order. Our results, for a finite number of fermion species, N, show the existence of a tricritical point in the temperature and chemical potential phase diagram for discrete chiral phase transition allowing us to precisely to locate it. By studying the phase diagram in the pressure and inverse density plane, we also show the existence of a liquid-gas phase, which, so far, was unknown to exist in this model. Finally, we also derive N dependent analytical expressions for the fermionic mass, critical temperature and critical chemical potential.

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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