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arXiv 1503.06139hep-thcond-mat.stat-mechhep-lat
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t Hooft大$N$极限下的非平凡热力学

Nontrivial Thermodynamics in 't Hooft's Large-$N$ Limit

Axel Cortés Cubero

摘要:

研究了(1+1)维${\rm SU}(N)$主手征西格玛模型在平面极限下的有限体积/温度关联函数。已知西格玛模型的精确S-矩阵在大$N$上大大简化,并且这导致平凡的热力学Bethe anomaly(TBA)方程。配分函数,如果使用TBA导出,可以被证明是自由粒子的配分函数。我们表明,在有限体积/温度的关联函数和期望值的运营商不是那些自由理论,TBA没有提供足够的信息来计算它们。我们的分析是使用有限体积扩散器的Leclair-Mussardo公式和精确的无限体积形状因子的知识来完成的。我们提出的能量动量张量的一点函数,和两点函数的重整化场算子的分析结果。能量-动量张量的结果可以用来定义一个非平凡的配分函数。

英文摘要:

We study the finite volume/temperature correlation functions of the (1+1)-dimensional ${\rm SU}(N)$ principal chiral sigma model in the planar limit. The exact S-matrix of the sigma model is known to simplify drastically at large $N$, and this leads to trivial thermodynamic Bethe ansatz (TBA) equations. The partition function, if derived using the TBA, can be shown to be that of free particles. We show that the correlation functions and expectation values of operators at finite volume/temperature are not those of the free theory, and that the TBA does not give enough information to calculate them. Our analysis is done using the Leclair-Mussardo formula for finite-volume correlators, and knowledge of the exact infinite-volume form factors. We present analytical results for the one-point function of the energy-momentum tensor, and the two-point function of the renormalized field operator. The results for the energy-momentum tensor can be used to define a nontrivial partition function.

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