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arXiv 2103.08492hep-thcond-mat.stat-mechmath-phmath.MP
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sine-Gordon模型中的分支点扭曲场形状因子I:呼吸子聚变和纠缠动力学

Branch Point Twist Field Form Factors in the sine-Gordon Model I: Breather Fusion and Entanglement Dynamics

Olalla A. Castro-Alvaredo, David X. Horvath

摘要:

量子sine-Gordon模型是最简单的有质量相互作用可积量子场论,其两粒子散射矩阵一般是非对角的。因此,这是一个得到广泛研究的模式,特别是在自助方案的背景下。在本文中,我们计算的形状因子的一个特殊的局域场称为分支点扭曲场,其关联函数的纠缠措施的积木。我们认为有吸引力的制度,该理论poseses的粒子谱组成的孤子,反孤子(相反的$U(1)$收费)和几个(中性)呼吸。在呼吸者部门,我们利用融合过程来计算较重的呼吸者的形状因子从那些较轻的。我们将我们的结果应用于研究的纠缠动力学后,一个小的质量淬火和短时间。我们发现,在存在两个或两个以上的呼吸的冯诺依曼和雷尼熵显示无阻尼振荡的时间,其频率是成比例的均匀呼吸质量和其振幅是成比例的呼吸的一个粒子的形状因子。

英文摘要:

The quantum sine-Gordon model is the simplest massive interacting integrable quantum field theory whose two-particle scattering matrix is generally non-diagonal. As such, it is a model that has been extensively studied, especially in the context of the bootstrap programme. In this paper we compute the form factors of a special local field known as the branch point twist field, whose correlation functions are building blocks for measures of entanglement. We consider the attractive regime where the theory posesses a particle spectrum consisting of a soliton, an antisoliton (of opposite $U(1)$ charges) and several (neutral) breathers. In the breather sector we exploit the fusion procedure to compute form factors of heavier breathers from those of lighter ones. We apply our results to the study of the entanglement dynamics after a small mass quench and for short times. We show that in the presence of two or more breathers the von Neumann and Rényi entropies display undamped oscillations in time, whose frequencies are proportional to the even breather masses and whose amplitudes are proportional to the breather's one-particle form factor.

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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