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arXiv 1509.07544hep-phhep-th
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Fierz变换对某些四费米子相互作用模型的量子效率的可能影响

Possible Effects of Fierz Transformations on Vacua of Some Four-Fermion Interaction Models

Bang-Rong Zhou

摘要:

本文系统地研究了Fierz变换对某些2味和$N_c$四色费米子(夸克)相互作用模型基态(真空)的可能影响。根据已知的反夸克-夸克相互作用的判据,($\bar{q}$ - $q$)和双夸克态($q$ - $q$)在4D时空中凝聚,对于给定的具有手征对称性的$\bar{q}$ - $q$通道耦合和来自重胶子交换,Fierz变换的影响不足以改变模型真空只能处于纯$\bar{q}$ - $q$凝聚相的特征。然而,对于给定的纯标量$q$通道,只有当$N_c<9$和$H_S$很小时,Fierz变换才会导致非平凡效应,即模型的真空可能处于预期的$q$凝聚相中,并且随着$N_c$和$H_S$的增加,真空将首先在与$q$和$\bar{q}$缩合物共存的相中得到,然后在纯$q$缩合物相中得到,直到$N_c\rightarrow\infty$。从二维和三维时空中的相关四费米子相互作用模型中也得到了类似的结论。指出了研究的一般意义。

英文摘要:

A theoretical research on possible effects of the Fierz transformations on the ground states (vacua) of some 2-flavor and $N_c$-color four-fermion (quark) interaction models has been systematically conducted. It has been shown that, based on the known criterions of the interplay between the antiquark-quark ($\bar{q}$-$q$) and diquark ($q$-$q$) condensates, in 4D space-time, for the given $\bar{q}$-$q$ channel couplings with chiral symmetry and from the heavy gluon exchange, the effects of the Fierz transformations are not enough to change the feature that the models' vacua could only be in the pure $\bar{q}$-$q$ condensate phases. However, for a given pure scalar $q$-$q$ channel coupling with the strength $H_S$, the Fierz transformations will lead to the nontrivial effect that the model's vacuum could be in the expected $q$-$q$ condensate phase only if $N_c<9$ and $H_S$ is small, and as the increase of $N_c$ and $H_S$, the vacuum will get first in a coexistence phase with $q$-$q$ and $\bar{q}$-$q$ condensates then in a pure $\bar{q}$-$q$ condensate phase until $N_c\rightarrow\infty$. Similar conclusions are also drawn from relevant four-fermion interaction models in 2D and 3D space-time. The general significance of the research is indicated.

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