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arXiv 2009.13383hep-latcond-mat.stat-mechhep-th
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具有$θ$项的$U(1)$格点规范理论的伊辛模型

Ising model as a $U(1)$ Lattice Gauge Theory with a $θ$-term

Tin Sulejmanpasic

摘要:

讨论了1+1维任意格点上的$θ$ -项规范XY模型,证明了在强规范耦合的极限下,只要拓扑项是通过Villain作用量定义的,该理论精确地约化为对偶格点上的二维伊辛模型.通过比较强、弱规范耦合极限讨论了相图,并在中等耦合下进行了蒙特卡罗模拟。我们利用更高形式的U(1)规范场类似物将对偶性推广到高维伊辛模型。

英文摘要:

We discuss a gauged XY model a $θ$-term on an arbitrary lattice in 1+1 dimensions, and show that the theory reduces exactly to the 2d Ising model on the dual lattice in the limit of the strong gauge coupling, provided that the topological term is defined via the Villain action. We discuss the phase diagram by comparing the strong and weak gauge coupling limits, and perform Monte Carlo simulations at intermediate couplings. We generalize the duality to higher-dimensional Ising models using higher-form U(1) gauge field analogues.

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