标题： 中子电偶极矩的格点QCD上限 显示英文标题

标题： An upper limit to the electric dipole moment of the neutron from lattice QCD

摘要： 随着拓扑易位率的体积线性增加，可能表明宇称和时间反演的自发破缺，这是由于拓扑电荷的真空期望值不为零。 这种破缺将产生中子的非零电偶极矩，d_n。 从不同体积的数值模拟中得出d_n的上限。 显示英文摘要

摘要： A linear increase with the volume of the topological susceptibility can signal spontaneous breaking of parity and time inversion, due to a nonzero vacuum expectation value of the topological charge. Such a breaking would produce a nonzero electric dipole moment of the neutron, d_n. An upper limit to d_n is derived from numerical simulations at increasing volumes.