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arXiv 1010.0229cond-mat.stat-mech
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O(N)模型的双圈交叉尺度函数

Two-Loop Crossover Scaling Functions of the O(N) Model

Denjoe O'Connor, J. A. Santiago, C. R. Stephens, A. Zamora

摘要:

利用环境友好重正化方法,对描述$O(N)$模型状态方程的重正化常数在整个临界区的级数进行了解析计算.β函数方程的解,对于运行耦合到两个环路,表现出与Goldstone模式相关联的强耦合不动点与Wilson-Fisher不动点之间的交叉。威尔逊函数$γ_λ$、$γ_ϕ$和$γ_{ϕ^2}$,以及与横向顶点函数的重整化相关的有效临界指数,也表现出这些不动点之间的非平凡交叉。

英文摘要:

Using Environmentally Friendly Renormalization, we present an analytic calculation of the series for the renormalization constants that describe the equation of state for the $O(N)$ model in the whole critical region. The solution of the beta-function equation, for the running coupling to order two loops, exhibits crossover between the strong coupling fixed point, associated with the Goldstone modes, and the Wilson-Fisher fixed point. The Wilson functions $γ_λ$, $γ_ϕ$ and $γ_{ϕ^2}$, and thus the effective critical exponents associated with renormalization of the transverse vertex functions, also exhibit non-trivial crossover between these fixed points.

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