通过解析延拓研究 Yang-Mills 谱的 $θ$ 依赖性
The $θ$-dependence of the Yang-Mills spectrum from analytic continuation
AI总结:
该研究利用虚 $θ$ 格点模拟和边界条件并行回火算法,计算 $\mathrm{SU}(N)$ Yang-Mills 理论中弦张力与最轻胶球质量的 $θ^2$ 系数,并给出 $N=3$ 连续统外推及 $N=6$ 精细格点结果。
摘要:
我们研究四维 $\mathrm{SU}(N)$ Yang-Mills 理论中弦张力和最轻胶球质量的 $θ$ 依赖性。更具体地说,我们关注参数化这些量的 $\mathcal{O}(θ^2)$ 依赖性的系数,通过使用 $θ$ 参数的虚数值对格点离散化理论进行数值模拟来研究这些系数。大 $N$ 时的拓扑冻结通过使用 Parallel Tempering on Boundary Conditions 算法加以避免。我们给出了 $N=3$ 情形下这些系数受控的连续统外推,并报告了在 $N=6$ 时两个相当精细的格点间距上获得的结果。
英文摘要:
We study the $θ$-dependence of the string tension and of the lightest glueball mass in four-dimensional $\mathrm{SU}(N)$ Yang-Mills theories. More precisely, we focus on the coefficients parametrizing the $\mathcal{O}(θ^2)$ dependence of these quantities, which we investigate by means of numerical simulations of the lattice-discretized theory, carried out using imaginary values of the $θ$ parameter. Topological freezing at large $N$ is avoided using the Parallel Tempering on Boundary Conditions algorithm. We provide controlled continuum extrapolations of such coefficients in the $N=3$ case, and we report the results obtained on two fairly fine lattice spacings for $N=6$.
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