标题： 高斯定律的全局约束与强CP问题的解 显示英文标题

标题： Global Constraints of Gauss' Law and the Solution to the Strong CP Problem

摘要： 这是近期工作的简要回顾。 结果显示，高斯定律的全局约束确保了真空角度在磁单极子规范理论中必须是量子化的。 我们的量子化规则为 $\theta=0$，或者$\theta=2\pi N/n~ (n\neq 0)$，其中整数 n 是磁单极子的相关拓扑荷，N 是这种方法中未固定的整数。 这从理论上进一步证实了作者$^1$最初提出的结论：由于磁单极子的存在，强 CP 问题可以得到解决；强 CP 破坏只能如此之小或消失这一事实可能意味着磁单极子的存在，且宇宙是开放的。 显示英文摘要

摘要： This is a brief review on the work done recently. It is shown that the global constraints of Gauss' law ensure that the vacuum angle must be quantized in gauge theories with magnetic monopoles. Our quantization rule is given as $\theta=0$, or $\theta=2\pi N/n~ (n\neq 0)$ with integer n being the relevant topological charge of the magnetic monopole and N is an unfixed integer in this approach. This theoretically confirms further the conclusion originally proposed by the author$^1$ that the strong CP problem can be solved due to the existence of magnetic monopoles, the fact that the strong CP-violation can be only so small or vanishing may imply the existence of magnetic monopoles, and the universe is open.