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arXiv 1810.04583hep-th
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三维张量Gross-Neveu模型的Phase diagram和不动点

Phase diagram and fixed points of tensorial Gross-Neveu models in three dimensions

Dario Benedetti, Nicolas Delporte

摘要:

通过适当的张量收缩模式的四次相互作用扰动$N^3$费米子的标准Gross-Neveu模型,我们将原始的$U(N^3)$对称性降低到$U(N)\times U(N^2)$或$U(N)\times U(N)\times U(N)$。在大的$N$限制,我们表明,在三维空间中,这样的模型承认新的紫外线不动点减少对称性,除了众所周知的最大对称性。相图明显地呈现了对称群的一个$U(N)$分量具有自发对称性破缺的新相位。

英文摘要:

Perturbing the standard Gross-Neveu model for $N^3$ fermions by quartic interactions with the appropriate tensorial contraction patterns, we reduce the original $U(N^3)$ symmetry to either $U(N)\times U(N^2)$ or $U(N)\times U(N)\times U(N)$. In the large-$N$ limit, we show that in three dimensions such models admit new ultraviolet fixed points with reduced symmetry, besides the well-known one with maximal symmetry. The phase diagram notably presents a new phase with spontaneous symmetry breaking of one $U(N)$ component of the symmetry group.

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