标题： 一个CPT异常 显示英文标题

标题： A CPT anomaly

摘要： 我们考虑定义在四维时空流形上的手征规范理论，该流形至少在一个紧致空间维度上具有笛卡尔乘积结构。 为了简化设定，我们在保持规范不变性的同时，通过积分消去手征费米子来计算有效规范场作用量。 由于红外和紫外效应的共同作用，在有效规范场作用量中会出现CPT奇异数项。 只要时空流形具有适当的拓扑结构，这种CPT异常可能出现在与基本粒子物理相关的手征规范理论中。 讨论了两个可能的宇宙学应用。 显示英文摘要

摘要： We consider chiral gauge theories defined over a four-dimensional spacetime manifold with a Cartesian product structure for at least one compact spatial dimension. For a simple setup, we calculate the effective gauge field action by integrating out the chiral fermions, while maintaining gauge invariance. Due to a combination of infrared and ultraviolet effects, there appears a CPT-odd term in the effective gauge field action. This CPT anomaly could occur in chiral gauge theories relevant to elementary particle physics, provided the spacetime manifold has the appropriate topology. Two possible applications for cosmology are discussed.