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arXiv 2107.09020hep-thcond-mat.str-elhep-lat
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$N_f=2$ QED $_3$的共形性和自对偶性

Conformality and self-duality of $N_f=2$ QED$_3$

Zhijin Li

摘要:

我们研究了耦合到$N_f=2$味的双组分狄拉克费米子的三维量子电动力学(QED $_3$)的红外相位。该理论已被提出是自对偶的对称性增强$(SU(2)_f\times U(1)_t )/\mathbb{Z}_2\rightarrow O(4)$在红外固定点。我们主要研究了$U(1)_t$中具有单位拓扑荷的双线性算子的四点相关器。我们说明了$O(4)\rightarrow SU(2)_f\times U(1)_t $分支规则的基础上的$O(4)$对称正结构的四点交叉方程。我们利用共形bootstrap方法导出了CFT数据的非微扰约束,并检验了$N_f=2$ QED $_3$的共形性和自对偶性.特别是,我们发现从以前的晶格模拟得到的CFT数据可以排除通过在光谱中引入不相关的假设,表明$N_f=2$ QED $_3$的IR相位是不共形的。

英文摘要:

We study the IR phase of three dimensional quantum electrodynamics (QED$_3$) coupled to $N_f=2$ flavors of two-component Dirac fermions, which has been controversial for decades. This theory has been proposed to be self-dual with symmetry enhancement $(SU(2)_f\times U(1)_t )/\mathbb{Z}_2\rightarrow O(4)$ at the IR fixed point. We focus on the four-point correlator of monopole operators with unit topological charge of $U(1)_t$. We illustrate the $O(4)\rightarrow SU(2)_f\times U(1)_t $ branching rules based on an $O(4)$ symmetric positive structure in the monopole four-point crossing equations. We use conformal bootstrap method to derive nonperturbative constraints on the CFT data and test the conformality and self-duality of $N_f=2$ QED$_3$. In particular we find the CFT data obtained from previous lattice simulations can be ruled out by introducing irrelevant assumptions in the spectrum, indicating the IR phase of $N_f=2$ QED$_3$ is not conformal.

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