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固定四维时空流形上的手征规范理论，该流形至少有一个紧致的空间维度具有笛卡尔积结构，例如 闵可夫斯基3空间和一个圆周的乘积。 为了一个简单的设置，我们计算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奇的项。 如果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。 显示英文摘要

摘要： We consider chiral gauge theories defined over a fixed four-dimensional space-time manifold with a Cartesian product structure for at least one compact spatial dimension, e.g. the product of Minkowskian 3-space and a circle. For a simple set-up, 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 which are relevant to elementary particle physics, provided the space-time manifold has the appropriate topology.