论文标题
难以捉摸的异常
Elusive anomalies
论文作者
论文摘要
通常，为了用扰动方法计算异常（无论是手性还是痕迹），最低的显着顺序就足够了。借助量规或差异不变性，它独特地识别了异常。本说明是对痕量异常计算中出现的歧义的简短回顾，尤其是指信号案例，其中最低扰动顺序不足以明确识别痕量异常。这可能会阐明一些最近的矛盾结果。
Usually, in order to compute an anomaly (be it chiral or trace) with a perturbative method, the lowest significant order is sufficient. With the help of gauge or diffeomorphism invariance it uniquely identifies the anomaly. This note is a short review of the ambiguities that arise in the calculation of trace anomalies, and is meant, in particular, to signal cases in which the lowest perturbative order is not enough to unambiguously identify a trace anomaly. This may shed light on some recent contradictory results.
