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arXiv 1909.02640hep-th
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$T \bar T$下的可积性与重整化

Integrability and Renormalization under $T \bar T$

Vladimir Rosenhaus, Michael Smolkin

摘要:

斯米尔诺夫和扎莫洛奇科夫最近引入了一类新的二维量子场论,通过能量动量张量的行列式对任何现有理论进行微分变换来定义。从这个$T\bar T$流动方程中,可以找到$T\bar T$变形理论的能谱和$S$矩阵的简单表达式.我们的目标是找到$T\bar T$变形理论的重整化拉格朗日量。在可积理论的$T\bar T$变形的上下文中,变形的理论也是可积的,并且相应地,$S$ -矩阵分解为二对二的$S$ -矩阵。因此,人们可能希望能够从$S$ -矩阵中提取重整化拉格朗日量。我们这样做明确的$T\bar T$变形的自由质量标量,二阶的变形参数。一旦有了重整化拉格朗日量,原则上就可以计算所有其他的可观测量,例如关联函数。我们简要地讨论这一点,以及重整化拉格朗日,$T\bar T$流方程,和$S$ -矩阵之间的关系。我们还提到一类更一般的自由标量场理论的保积变形。

英文摘要:

Smirnov and Zamolodchikov recently introduced a new class of two-dimensional quantum field theories, defined through a differential change of any existing theory by the determinant of the energy-momentum tensor. From this $T\bar T$ flow equation one can find a simple expression for both the energy spectrum and the $S$-matrix of the $T\bar T$ deformed theories. Our goal is to find the renormalized Lagrangian of the $T\bar T$ deformed theories. In the context of the $T\bar T$ deformation of an integrable theory, the deformed theory is also integrable and, correspondingly, the $S$-matrix factorizes into two-to-two $S$-matrices. One may thus hope to be able to extract the renormalized Lagrangian from the $S$-matrix. We do this explicitly for the $T\bar T$ deformation of a free massive scalar, to second order in the deformation parameter. Once one has the renormalized Lagrangian one can, in principle, compute all other observables, such as correlation functions. We briefly discuss this, as well as the relation between the renormalized Lagrangian, the $T\bar T$ flow equation, and the $S$-matrix. We also mention a more general class of integrability-preserving deformations of a free scalar field theory.

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