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arXiv 1005.1822hep-thhep-lat
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有限温度Schwinger模型

Finite Temperature Schwinger Model

Ivo Sachs, Andreas Wipf

摘要:

用欧氏泛函积分方法计算了Schwinger模型的序参量随温度的变化关系。为此,我们在有限环面上求解模型,并在计算结束时使空间扩展趋于无穷大。导出了环面上的诱导作用量、费米子零模、相应的格林函数和威尔逊圈算符。我们发现了任意温度下手征凝聚体的解析形式,特别是当温度大于诱导光子质量时,手征凝聚体的行为类似于\< \bar凝聚\> \sim-2 T \exp(-π \sqrt πT/e).

英文摘要:

The temperature dependence of the order parameter of the Schwinger model is calculated in the euclidean functional integral approach. For that we solve the model on a finite torus and let the spatial extension tend to infinity at the end of the computations. The induced actions, fermionic zero-modes, relevant Green functions and Wilson loop correlators on the torus are derived. We find the analytic form of the chiral condensate for any temperature and in particular show that it behaves like \< \barΨΨ\> \sim -2 T\exp(-π\sqrtπT/e) for temperatures large compared to the induced photon mass.

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