论文标题
强大的CP问题，一般协方差和视野
The strong CP problem, general covariance, and horizons
论文作者
论文摘要
我们讨论了地平线存在的量子场理论的强烈CP问题。我们认为，一般协方差对理论的拓扑结构施加了约束。特别是，与QCD一样，这意味着该理论的不同拓扑部门只能毫无疑问，因为必须追溯到地平线以外的自由度，以使一般的协方差适用。这可能会导致解决所谓的强CP问题的解决方案，而无需额外的可观察动态。
We discuss the strong CP problem in the context of quantum field theory in the presence of horizons. We argue that general covariance places constraints on the topological structure of the theory. In particular, as in QCD, it means that different topological sectors of the theory can only sum incoherently, because the degrees of freedom beyond the horizon must be traced over for general covariance to apply. This might lead to a solution of the so-called strong CP problem without extra observable dynamics.
