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arXiv 0909.4522hep-phhep-th
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反常极作为手征反常和共形反常的共同特征

Anomaly Poles as Common Signatures of Chiral and Conformal Anomalies

Roberta Armillis, Claudio Coriano, Luigi Delle Rose

摘要:

在微扰框架下分析手征异常的一个特征是出现无质量极点,它们可以通过异常图的光谱分析来识别,通常被解释为红外起源。最近的研究表明,它们的存在不仅局限于红外线,但它们出现在最一般的运动学条件下的有效作用,即使他们在红外线去耦。进一步的研究表明,它们是这些理论在紫外(UV)区域的非幺正行为的原因。我们扩展这种分析的情况下的共形异常,表明有效的行动描述的相互作用的规范场与重力的特点是异常极点,使整个异常和解耦的红外线(IR),在完全类似的手征的情况下。这补充了相关的分析Giannotti和Mottola在重力的痕迹异常,其中异常极点已被确定在相应的相关器中使用色散理论在IR。我们的扩展是基于一个精确的计算的外壳外关联函数涉及的能量动量张量和两个矢量电流(规范规范重力子顶点),这是负责的外观异常。

英文摘要:

One feature of the chiral anomaly, analyzed in a perturbative framework, is the appearance of massless poles which account for it. They are identified by a spectral analysis of the anomaly graph and are usually interpreted as being of an infrared origin. Recent investigations show that their presence is not just confined in the infrared, but that they appear in the effective action under the most general kinematical conditions, even if they decouple in the infrared. Further studies reveal that they are responsible for the non-unitary behaviour of these theories in the ultraviolet (UV) region. We extend this analysis to the case of the conformal anomaly, showing that the effective action describing the interaction of gauge fields with gravity is characterized by anomaly poles that give the entire anomaly and are decoupled in the infrared (IR), in complete analogy with the chiral case. This complements a related analysis by Giannotti and Mottola on the trace anomaly in gravity, in which an anomaly pole has been identified in the corresponding correlator using dispersion theory in the IR. Our extension is based on an exact computation of the off-shell correlation function involving an energy-momentum tensor and two vector currents (the gauge-gauge-graviton vertex) which is responsible for the appearance of the anomaly.

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