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arXiv 0711.0918cond-mat.stat-mechcond-mat.otherhep-phhep-th
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二维相变的重整化群函数:奇异贡献问题

Renormalization Group Functions for Two-Dimensional Phase Transitions: To the Problem of Singular Contributions

A. A. Pogorelov, I. M. Suslov

摘要:

根据现有的出版物,场论重整化群(RG)方法在二维情况下给出的临界指数不同于已知的精确值。这一事实是试图解释的存在非分析的贡献,在RG功能。在这项工作中,使用一种新的算法进行分析的情况下,求和发散系列,使其能够分析的依赖性的结果的临界指数的RG函数的展开系数。它已被证明,所有的指数的精确值可以得到一个合理的形式的系数函数。这些函数具有小的非单调性或拐点,这在自然插值中很难再现。没有必要假设RG函数中存在奇异贡献。

英文摘要:

According to the available publications, the field theoretical renormalization group (RG) approach in the two-dimensional case gives the critical exponents that differ from the known exact values. This fact was attempted to explain by the existence of nonanalytic contributions in the RG functions. The situation is analysed in this work using a new algorithm for summing divergent series that makes it possible to analyse dependence of the results for the critical exponents on the expansion coefficients for RG functions. It has been shown that the exact values of all the exponents can be obtained with a reasonable form of the coefficient functions. These functions have small nonmonotonities or inflections, which are poorly reproduced in natural interpolations. It is not necessary to assume the existence of singular contributions in RG functions.

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