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arXiv 1501.03329hep-thcond-mat.str-el
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QED $_{3}$中动力学费米子质量产生的红外行为

Infrared behavior of dynamical fermion mass generation in QED$_{3}$

Jing-Rong Wang, Guo-Zhu Liu, Chang-Jin Zhang

摘要:

广泛的研究表明,当费米子味$N$足够小时,QED $_{3}$在零温下表现出动力学费米子质量产生。然而,似乎很难将理论分析扩展到有限温度。在考虑了有限温度和无序诱导费米子阻尼的影响后,我们用Dyson-Schwinger方程方法研究了这个问题。在广泛使用的瞬时近似下,动力学质量在这两种情况下都显示出红外发散。然后,我们采用了一个新的近似,其中包括一个依赖于能量的规范玻色子传播子,并获得不包含红外发散的动力学费米子质量的结果。新的近似的有效性进行检查比较,在零温度下得到的既定结果。

英文摘要:

Extensive investigations show that QED$_{3}$ exhibits dynamical fermion mass generation at zero temperature when the fermion flavor $N$ is sufficiently small. However, it seems difficult to extend the theoretical analysis to finite temperature. We study this problem by means of Dyson-Schwinger equation approach after considering the effect of finite temperature or disorder-induced fermion damping. Under the widely used instantaneous approximation, the dynamical mass displays an infrared divergence in both cases. We then adopt a new approximation that includes an energy-dependent gauge boson propagator and obtain results for dynamical fermion mass that do not contain infrared divergence. The validity of the new approximation is examined by comparing to the well-established results obtained at zero temperature.

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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