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arXiv 2106.00364hep-lathep-phhep-th
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3+1维SU(N)规范理论:胶球谱、弦张力和拓扑

SU(N) gauge theories in 3+1 dimensions: glueball spectrum, string tensions and topology

Andreas Athenodorou, Michael Teper

摘要:

我们计算了3+1维SU(N)格点规范理论的低位胶球谱、弦张力、拓扑性质和运行耦合。我们对N = 2,3,. 12,使用具有Wilson元格作用的晶格模拟,并且对于三次旋转群的所有表示中的胶球状态,对于宇称和电荷共轭的值。我们将这些结果外推到每个理论的连续极限,然后到N=无穷大。对于这些状态中的一些,我们能够以非常小的模糊性识别它们的连续自旋。我们计算了弦的基本张力和k=2的弦张力,并研究了该比值对N的依赖性。以弦的张力为尺度,计算了晶格耦合的运行,并证实了g(a)**2随常数物理的1/N变化,当N->oo时。我们用3圈β函数拟合弦张力的计算值,并对所有的N值(包括SU(3))提取一个以弦张力为单位的λ-MSbar值。我们计算了N=2,...,6,其中它波动足够的连续体拓扑磁化率的合理估计。我们还计算重整化的晶格拓扑电荷,ZQ(β),我们所有的SU(N)规范理论,使用标准定义的收费,我们提供插值公式,这可能是有用的估计重整化的晶格θ参数。我们提供了定量的结果如何拓扑电荷“冻结”减少晶格间距和增加N,并显示我们如何cicument这个问题在我们的计算。

英文摘要:

We calculate the low-lying glueball spectrum, some string tensions and some properties of topology and the running coupling for SU(N) lattice gauge theories in 3+1 dimensions. We do so for N = 2,3,...12, using lattice simulations with the Wilson plaquette action, and for glueball states in all the representations of the cubic rotation group, for both values of parity and charge conjugation. We extrapolate these results to the continuum limit of each theory and then to N=infinity. For a number of these states we are able to identify their continuum spins with very little ambiguity. We calculate the fundamental string tension and k=2 string tension and investigate the N dependence of the ratio. Using the string tension as the scale, we calculate the running of a lattice coupling and confirm that g(a)**2 varies as 1/N for constant physics as N->oo. We fit our calculated values of the string tension with the 3-loop beta-function, and extract a value for Lambda-MSbar, in units of the string tension, for all our values of N, including SU(3). We calculate the topological charge Q for N=2,..,6 where it fluctuates sufficiently for a plausible estimate of the continuum topological susceptibility. We also calculate the renormalisation of the lattice topological charge, ZQ(beta), for all our SU(N) gauge theories, using a standard definition of the charge, and we provide interpolating formulae, which may be useful in estimating the renormalisation of the lattice theta parameter. We provide quantitative results for how the topological charge `freezes' with decreasing lattice spacing and with increasing N, and show how we cicumvent this issue in our calculations.

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