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arXiv 1506.03357hep-thcond-mat.stat-mechhep-lat
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六维φ ^3理论的四圈重整化

Four loop renormalization of phi^3 theory in six dimensions

J. A. Gracey

摘要:

我们用改进的最小减法(MSbar)格式在四个环上重整化了六维φ ^3理论。根据所得的β函数、异常维度和质量异常维度,我们计算了与Lee-Yang边奇异性和渗透问题相关的四个循环临界指数。使用remmation方法和相关的二维共形场论的指数的信息,我们得到的估计,在3,4和5维的指数与其他技术,这两个问题是合理的协议。为了得到五维空间中不同固定点处指数的估计,我们还计算了具有O(N)对称性的更一般理论的重整化群函数。包括在这个O(N)分析是全面评估的质量算子混合矩阵的异常尺寸在四个循环。我们证明了它的本征指数与非微扰大N展开中在O(1/N^2)处计算的质量指数是一致的。

英文摘要:

We renormalize six dimensional phi^3 theory in the modified minimal subtraction (MSbar) scheme at four loops. From the resulting beta-function, anomalous dimension and mass anomalous dimension we compute four loop critical exponents relevant to the Lee-Yang edge singularity and percolation problems. Using resummation methods and information on the exponents of the relevant two dimensional conformal field theory we obtain estimates for exponents in dimensions 3, 4 and 5 which are in reasonable agreement with other techniques for these two problems. The renormalization group functions for the more general theory with an O(N) symmetry are also computed in order to obtain estimates of exponents at various fixed points in five dimensions. Included in this O(N) analysis is the full evaluation of the mass operator mixing matrix of anomalous dimensions at four loops. We show that its eigen-exponents are in agreement with the mass exponents computed at O(1/N^2) in the non-perturbative large N expansion.

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