标题： CPT异常 显示英文标题

标题： A CPT Anomaly

摘要： 我们考虑定义在一个具有笛卡尔积结构的四维时空流形上的手征规范理论，至少有一个紧凑的空间维度。 对于一个简单的设置，我们计算了通过积分出手征费米子得到的有效规范场作用量，同时保持规范不变性。 由于红外和紫外效应的结合，在有效规范场作用量中出现了一个CPT奇数项。 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 fixed 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 obtained from 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.