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arXiv 1104.4783hep-thhep-phnucl-th
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2+1和3+1维Hagedorn谱和大$N_c$ QCD

The Hagedorn spectrum and large $N_c$ QCD in 2+1 and 3+1 dimensions

Thomas D. Cohen, Vojtěch Krejčiřík

摘要:

我们表明,Hagedorn谱(即,在2+1和3+1维的大$N_c$ QCD中,强子的数量随质量呈指数增长。这种方法是基于对夸克和胶子场构成的复合算符的欧几里德空间关联函数的研究,并利用了量子色动力学中已知的复合算符的短时行为。该演示依赖于一个关键的假设:微扰理论准确地描述了一个点到点关联函数的矩阵的对数在政权的微扰校正渐近自由值是小的跟踪。

英文摘要:

We show that a Hagedorn spectrum (i.e., spectrum where the number of hadrons grows exponentially with the mass) emerges automatically in large $N_c$ QCD in 2+1 and 3+1 dimensions. The approach is based on the study of Euclidean space correlation functions for composite operators constructed from quark and gluon fields and exploits the fact that the short time behavior of the correlators is known in QCD. The demonstration relies on one critical assumption: that perturbation theory accurately describes the trace of the logarithm of a matrix of point-to-point correlation functions in the regime where the perturbative corrections to the asymptotically free value are small.

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