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arXiv 0903.5524hep-thcond-mat.stat-mech
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sine-Gordon模型的重整化群格式比较

Comparison of renormalization group schemes for sine-Gordon type models

I. Nandori, S. Nagy, K. Sailer, A. Trombettoni

摘要:

本文研究了二维周期sine-Gordon型场论模型的局域势近似中重整化群(RG)流的方案依赖性,详细讨论了各种泛函RG方法的适用性。结果表明,Sine-Gordon模型和层状Sine-Gordon模型中Kosterlitz-Less-Berezinskii型相变发生的临界频率(温度)和大质量Sine-Gordon模型中Ising型相变的临界比等物理参数的确定可以与方案无关.对于后一种情况下的麦克斯韦建设代表了一个强有力的约束RG流的结果在一个计划独立的红外值的临界比。对于大量的sine-Gordon模型也收缩的域的相位与自发破缺的周期性发生由于量子涨落。

英文摘要:

The scheme-dependence of the renormalization group (RG) flow has been investigated in the local potential approximation for two-dimensional periodic, sine-Gordon type field-theoric models discussing the applicability of various functional RG methods in detail. It was shown that scheme-independent determination of such physical parameters is possible as the critical frequency (temperature) at which Kosterlitz-Thouless-Berezinskii type phase transition takes place in the sine-Gordon and the layered sine-Gordon models, and the critical ratio characterizing the Ising type phase transition of the massive sine-Gordon model. For the latter case the Maxwell construction represents a strong constraint on the RG flow which results in a scheme-independent infrared value for the critical ratio. For the massive sine-Gordon model also the shrinking of the domain of the phase with spontaneously broken periodicity is shown to take place due to the quantum fluctuations.

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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