2+1维SU（N）规范理论的闭弦谱
The closed string spectrum of SU(N) gauge theories in 2+1 dimensions
摘要：
本文用格点方法研究了2+1维SU（N）规范理论的闭弦谱。我们计算了长度在l ~ 0.45 fm和l ~ 3 fm之间的弦的最低~30态的能量，并与不同的理论预言进行了比较。我们得到明确的证据表明，闭弦的Nambu-Goto自由玻色弦的普适类。此外，我们清楚地看到，我们的数据可以用协变的弦论来描述，只要在很短的距离尺度上进行小/中等的修正，甚至在大N的所有距离尺度上都可以。
英文摘要：
We use lattice techniques to study the closed-string spectrum of SU(N) gauge theories in 2+1 dimensions. We calculate the energies of the lowest lying ~30 states for strings with lengths between l ~ 0.45 fm and l ~ 3 fm, and compare to different theoretical predictions. We obtain unambiguous evidence that the closed-strings are in the universality class of the Nambu-Goto free bosonic string. Moreover, we clearly see that our data can be described by a covariant string theory with a small/moderate correction down to very short distance scales, and possibly on all distance scales at large-N.
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