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arXiv hep-th/0101034hep-thcond-mat.stat-mech
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可积西格玛模型与扰动陪集模型

Integrable sigma models and perturbed coset models

Paul Fendley

摘要:

西格玛模型作为低能有效理论在粒子物理和凝聚态物理中频繁出现。本文计算了两类二维可积西格玛模型在任意温度下的精确自由能。这些理论,SU(N)/SO(N)和O(2 P)/O(P)x O(P)模型,是渐近自由的,并表现出电荷分馏。当瞬子耦合θ =pi时,它们分别流向SU(N)_1和O(2 P)_1共形场论。本文还将自由能计算推广到陪集共形场论SU(N)_k/SO(N)_{2k}和O(2 P)_k/O(P)_k × O(P)_k的有质量和无质量微扰。

英文摘要:

Sigma models arise frequently in particle physics and condensed-matter physics as low-energy effective theories. In this paper I compute the exact free energy at any temperature in two hierarchies of integrable sigma models in two dimensions. These theories, the SU(N)/SO(N) and O(2P)/O(P) x O(P) models, are asymptotically free and exhibit charge fractionalization. When the instanton coupling theta=pi, they flow to the SU(N)_1 and O(2P)_1 conformal field theories, respectively. I also generalize the free energy computation to massive and massless perturbations of the coset conformal field theories SU(N)_k/SO(N)_{2k} and O(2P)_k/O(P)_k x O(P)_k.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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