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arXiv 1107.3011hep-thhep-ph
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超对称O(N)模型在大N极限下的临界行为

Critical behavior of supersymmetric O(N) models in the large-N limit

Daniel F. Litim, Marianne C. Mastaler, Franziska Synatschke-Czerwonka, Andreas Wipf

摘要:

本文导出了三维超对称O(N)模型中尺度相关超势的超对称重整化群(RG)方程。对于超对称优化调节函数,我们精确地在大N极限下求解超势的RG方程。固定点的解决方案进行了分类的一个确切的边际耦合。在弱耦合区存在唯一的不动点解,对于中间耦合,我们发现两个独立的不动点解,而在强耦合区不存在全局定义的不动点势。我们确定了超势和相应标量势的临界指数。最后,我们将四维理论的高温极限与纯标量理论的Wilson-Fisher不动点联系起来。

英文摘要:

We derive a supersymmetric renormalization group (RG) equation for the scale-dependent superpotential of the supersymmetric O(N) model in three dimensions. For a supersymmetric optimized regulator function we solve the RG equation for the superpotential exactly in the large-N limit. The fixed-point solutions are classified by an exactly marginal coupling. In the weakly coupled regime there exists a unique fixed point solution, for intermediate couplings we find two separate fixed point solutions and in the strong coupling regime no globally defined fixed-point potentials exist. We determine the exact critical exponents both for the superpotential and the associated scalar potential. Finally we relate the high-temperature limit of the four-dimensional theory to the Wilson-Fisher fixed point of the purely scalar theory.

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