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arXiv 1112.0909hep-lathep-th
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规范理论中CP破坏拓扑项的模拟

Simulating a CP-violating topological term in gauge theories

Haralambos Panagopoulos, Ettore Vicari

摘要:

我们给出了关于四维SU(N)规范理论的θ依赖性的最新结果,其中θ是拉格朗日中CP违反拓扑项的系数。特别是,我们研究这些理论的标度行为,通过蒙特卡罗模拟在虚θ。数值结果提供了很好的证据标度在连续极限。基态能量对虚θ的依赖性被证明可以用θ =0附近的相关展开式的前几项很好地描述,从而提供了前几个系数的精确估计,直到O(θ ^6)。

英文摘要:

We present recent results on the theta-dependence of four-dimensional SU(N) gauge theories, where theta is the coefficient of the CP-violating topological term in the Lagrangian. In particular, we study the scaling behavior of these theories, by Monte Carlo simulations at imaginary theta. The numerical results provide good evidence of scaling in the continuum limit. The imaginary theta dependence of the ground-state energy turns out to be well described by the first few terms of related expansions around theta=0, providing accurate estimates of the first few coefficients, up to O(theta^6).

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