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arXiv 1102.3974hep-th
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三维Yukawa模型的相结构

Phase structure of a three-dimensional Yukawa model

Hidenori Sonoda

摘要:

利用精确重整化群的方法,研究了由一个实标量场和N个实旋量场组成的三维欧氏空间中O(N)不变Yukawa模型的重整化群流.我们得到一个相结构类似的N-矢量模型与立方各向异性,拥有一个区域的参数表现出一级转变。一个实费米子(N=1)的特殊情况与具有一个超对称性的Wess-Zumino模型属于同一普适类。对于Wilson-Fisher型不动点的临界指数,我们的单圈近似与以前的研究结果基本一致。

英文摘要:

We use the method of the exact renormalization group to study the renormalization group flows of an O(N) invariant Yukawa model in three dimensional Euclidean space consisting of one real scalar and N real spinor fields. We obtain a phase structure similar to that of the N-vector model with cubic anisotropy, possessing a region of parameters exhibiting a first order transition. The particular case with one real fermion (N=1) belongs to the same universality class as the Wess-Zumino model with one supersymmetry. For the critical exponents of the Wilson-Fisher type fixed points, our 1-loop approximations are generally consistent with the results of previous studies.

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