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arXiv 1809.02044hep-thcond-mat.stat-mechcond-mat.str-elnlin.SI
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可积QFT的热力学bootstrap程序:有限能量密度下的形状因子和关联函数

Thermodynamic bootstrap program for integrable QFT's: Form factors and correlation functions at finite energy density

Axel Cortés Cubero, Miłosz Panfil

摘要:

研究了有限能量密度态间可积QFT的局域算符的形状因子。这些状态出现,例如,在有限的温度下,或从广义吉布斯系综。我们概括了Smirnov的形状因子公理,制定了一套粒子/空穴激发的热力学背景上,而不是真空。我们表明,确切的形状因子可以找到这些新的公理的最小解。热力学形状因子可用于构造关于热力学状态的关联函数。两点函数的表达式类似于修正的勒克莱尔-穆萨多公式,但使用了热力学背景下的新形状因子,并对所有奇点进行了适当的正则化。我们研究了热两点函数的不同红外渐近性,并表明通常存在两种不同的制度,表现出大规模的指数衰减,或有效的无隙行为,在长距离,分别。作为一个例子,我们计算了sinh-Gordon模型的顶点算子的少激发形状因子。

英文摘要:

We study the form factors of local operators of integrable QFT's between states with finite energy density. These states arise, for example, at finite temperature, or from a generalized Gibbs ensemble. We generalize Smirnov's form factor axioms, formulating them for a set of particle/hole excitations on top of the thermodynamic background, instead of the vacuum. We show that exact form factors can be found as minimal solutions of these new axioms. The thermodynamic form factors can be used to construct correlation functions on thermodynamic states. The expression found for the two-point function is similar to the conjectured LeClair-Mussardo formula, but using the new form factors dressed by the thermodynamic background, and with all singularities properly regularized. We study the different infrared asymptotics of the thermal two-point function, and show there generally exist two different regimes, manifesting massive exponential decay, or effectively gapless behavior at long distances, respectively. As an example, we compute the few-excitations form factors of vertex operators for the sinh-Gordon model.

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